1500 pts vs Orks

Greetings,
I am playing a 1500 pts game on friday night against orks. I have never played him before so i dont know what he will bring. Here is my list

Ancient Haemmy-flesh gauntlet, liquifier gun and casket of flensing
4 grotesques inc an Aberration in a Raider with night shields
4 blasterborn in a venom with extra splinters
5 wracks with liquifier gun in Raider with Night shields
10 Kabalites with splinter cannon in Raider with splinter racks and night shields
10 Kabalites with splinter cannon in Raider with splinter racks and night shields
5 wyches with haywires in Venom with extra splinter cannon
5 wyches with haywires in Venom with extra splinter cannon
Ravager with night shields
Ravager with Night shields

plan is for the Ravagers, Blaster born and wyches to vehicle hunt while their venoms and kabalites are for anti-infantry, wracks are a objective jumper and the grots are there to smash ork face. Haemmy goes in the Grots.

As for anti-air I either try to minimise its impact or fire all 10 dark lances at them hoping for 6s

I don't know your meta or your opponent, and this is clearly biased against my experiences with the ork players in MY meta;
but my first reaction to this list is that you have too much anti-tank. Granted the blaster born are great for meganobs and bosses and etc, but I'd consider swapping one of the Ravagers to Dissie cannons, maybe cannons on the Raiders too. I just feel like you don't have enough anti-horde. If he fields green tide you're in danger of getting swamped.
You think about putting a liquifier in the Grots?

Yeah if i squeeze it in I will get a liquifer on them.....last time i played orks I took a big 20 man footslogging squad with double splinter cannons and they were great against grren hordes....thaks for the comments I will have a think about it....

This may be a little late.

Your total shots are 14 Dark Matter Shots with 62 Poison Shots a turn. Orks more or less with have more troops than armor. In my experience I would bring more shots to bear. Not to mention we can get rid of most of their armor saves. Not to mention their vehicles are pretty weak.

I say drop the Casket of Fleshing and Flesh Gun and the Aberration (Keeping the 4th Grot just no upgrade). Add an Agoniser to your Hammi. Take the blasters away, add Shardcarbines and Splinter Cannons, this gives you a lot more shots. You want more shots against Greenskins. You have two Ravengers plus 4 Raiders. That is 10 Dark Matter Shots total. Posion Shots total is about 76 and still have 30 points to play around with. If you have the model, then drop a unit of Wyches, I know that is -12 shots and Assaults are needed you might say. You are right. Remove the Haywires from the other Wych unit. Add a Talos +4 TL shots if it moves and hand to hand killer and you have enough points to add a TL Liquifier Gun.

So over all:
-Casket of Fleshing
-Flesh Gauntlet
-Blasters
-Wyches and Haywire Grenades with Venom and extra Splinter Cannon
-Haywire Grenades
Total: +235 Points to spending pool

+Agoniser to Old Hammi
+Shardcarbines to Trueborn
+2 Splinter Cannons to Trueborn
+Talos with TL Liquifier
(Hey lookie there still enough points to add a sit back squad of Warriors with blaster.)
+5 Warriors with Blaster.
Total: 225

Total Shots:
11 Dark Matter Shots (Took away 3 shots from your original total)
72 Posion Shots (Added 10 shots to your original total)
3 Liquifier Guns (Added 1 more and it is TL to boot!)

Tell us how you did! I hope you bring plenty of prizes back!

Ya that! ^
Best of luck.