Engine parts assembler (builder) has been a sore spot with many over the years. Personally purchasing all the right parts is only the begining. I too do it that way. I work with manufactures ie: CP, Arias, Cunningham, Carillo, Howard, Elgin, Isky, Marine Crankshaft, etc. to get cams, pistons, rings, bearings, springs, drives, etc. again and then start assembly. Fitting a crank in a block takes me a day before I put in the rear main seal. Ring fitting takes me a week of nights after work and checking piston/head clearance the same.
Can I pay some one to do this and trust their work. Yes, probably, no, ?, I don't know. I did for my cylinder head and I recieved a report including every spring setting, clearances etc. and I trust his work. Would I do it for a short block probably not. #1 it's really expensive to do it right because it's time consuming and it's truely my fun.
Someone once told me you get what you pay for.......Even if you pay a lot you still may not get it..
I always know who to blame and it seems I can always find the next weak link. Darn it....I wish everyone good luck......................JD