[Bob Pagano]

3/4 rule still used, maximum variation from left to right 1" as per rule book. It is like that to keep the wheels in the beams longer, it is legal. The block, you can use any GM block even a bowtie, stock crank and aftermarket rods listed on nhra site. In some cases you can use the GM alum heads 401 otherwise only what is listed in the blueprint spec sheets listed at nhra. there is also a replacement intake in some cases, not knowing what you are building limits what I can tell you. If you would like anymore info email me I would be glad to help.