Should I get 58 or 64cc GT-40x heads?

Hi guys,
I tried looking up as much info as I could about this, but I couldn't get a definate answer. Hopefully you can help me out.

Anyway, I can get a really good deal on GT-40x aluminum heads with either the 58or 64cc combustion chambers. I know they aren't the best flowing heads out there, but it's a good deal and I'm on a budget.

My question is, with my combo, exactly as it is now, which ones should I get. The58cc or 64cc. The 58cc should give me more compression, but I've heard there might be a greater chance of having piston to valve clearance issues. Would I give a bit of power by going with the 64cc heads? Which would I benefit more from with my combo?

As always, any help appreciated
Thanks

Nevermind that post. I can get a set of Edelbrock performers for a $100 more. Has anyone seen this setup before and how well would it work?

Edelbrock performer 60379 heads
Cobra upper lower intake (lower ported)
crane 2031 cam w/1.7 rr

You mean 290hp at the wheels right. I hope so, because I'm pushing 310-315 at the flywheel with my stock, unported gt40 iron heads.

yes at the wheels!

Click to expand...

Ha, good man!

Should I swap over my Crane valve springs to the edelbrock heads since they are made to work with my cam, or will the edelbrock springs be ok?