[64speed]

I went with aluminum because for one all I had was a block and for two by the time I bought good known heads, had them ported and rebuilt I would be 3/4 of the way to the Edelbrock. I could have saved a little money going with them out of the box but I heard too many stories of inconsistent chamber volume etc so I paid for “ The Butler Treatment” too bad they said it would take 8-10 weeks to get them