Thanks guys. I'd actually bought a standard bore '78 440 block last month that I initially planned on building and was going to accept the risk that I'd eventually crack it, but after adding up the machining costs to get that usable vs. buying this, it really seemed like spending the extra ~$4k difference upfront was worth it. Going to do it once and do it correctly, and now I won't have to worry about hurting the block just through fatigue. Time to upgrade the nitrous supply line from a -4 to a -6.

Great info Rich, thank you. I'll look to see what pickup adapter it comes with when it shows up. Sounds like a 540 and possibly a 557 would fall together no problem, but a 572 would need a 3/8" pickup instead of 1/2" and still might require clearancing.

Andy, your point is well taken as well. The 270's might be a little small for a 572 but should be perfect at 540". It's geared that with 12% converter slip, 7000 rpm is ~135 mph and that'll be the new goal for 1/4 mile mph.