I've got a 1977 C10 that i'm doing a frame up deal on. I'm looking at switching to a big block. I'm looking at some PAW engine block "kits" and there are 2 that got my attention a 427 bb and a 454 bb They're both $1800. before I get into this I want to say that i don't want to go over 6000 rpm its going to be daily drivin with the occasional weekend drag race at the strip. So they are both the same exept the 427 has the "factory forged internals" and the 454 is cast. Should I go for the forged 427 or the cast 454? Anyone hear anything good about PAW engines? One more stupid question I forgot to ask. am I correct to assume that chevy big blocks and small blocks use the same bolt pattern? My dad works with fords so that's what I'm use to... from what I understand I COULD take a TH350 or TH400 and use it on either or? Has anyone used the TH350 and a big block and had good results? This chevy stuff is all new to me.