I had a set ot these with 72cc chambers on my SBC and they were not what I expected. Needless to say I now have a pair of AFR 195cc heads with 65cc chambers. Huge improvement. I have a friend with Edelbrock Performer 170cc heads, 64 cc chambers on a similar set up to mine and he loves them. very good performance and a fair bit less money than the AFR's.
You have a big job ahead of you as there are alot of very good heads out there. Vortecs flow real well and are a complete steal at the price.
Good luck