Hyde - here is thread of a similar question I asked before ERA601 came along into my life at a price I couldn't turn down.
GT40 Turbo Swirl heads vs Performer
My heart is still with your project....I
will build my ultimate car some day - an FIA sb .
I think my conclusion was the GT40P's were certainly cost effective, albeit giving up some HP. I was matching to Edelbrock components - intake/carb/cam (which I still have tucked away), and the Edelbrock performers were about $150.00 more when delivery was factored in (through Summit). If you go the Gt40P's you may want to check out a supplier I was looking at called Hawaii Racing -
http://www.hawaiiracing.com - I think the GT40P heads were like $850.00/
pr.
Good luck!
