Need advice what to do with TFS TW heads

[Slow5.0]

Ok here is a deal,
I have Twisted Wedge heads that are milled .035 or .040 (not sure because guy who sold them to me don't remember exactly)
I have plan build nice 306 with my block and good 306 kit
I going with 9:1 compression (8-12 psi from turbo) but problem are my heads because those heads are milled and if i use them i will bump compression .6 to .7 so it will be 9.6 or 9.7 which i don't wanna

I have 4 solutions

1. Get pistons that are 8.3:1 so with heads compression will be 9:1
2. Get thicker headgasket
3. Machined combustion chambers to get previous cc
4. Get new TW heads with stock CCs

I don't wanna spend a lot of money so it have to be on budget but good

Don't post "sale TW and get AFR" or something like
Or don't build 306,build 331 or 347

 

[Grn92LX]

Have your heads cc'd to verify the actual cc. This will cost around $25 at a machine shop. Then find out what dish piston you could run to get around 9:1 compression with that cc. You can always run a thicker/thinner head gasket to get what you need with the pistons.

 

[Slow5.0]

So #1 solution , just like machin shop told me
Yeah Grn92LX guy in local machine shop told me same (check cc and figure out what compression i need

Thanks man

 

[blksn955.o]

Also if your going to buy a good kit and you know the cc of the heads you can pass that info to the company and tell them your plans and goals...they should be able to get a piston to work with your heads and rec. what to mill the block to to get the needed comp. ratio were you want it.