[El Dorado Jim]

I agree with Rod Run, most machine shops that I have had rebuild engines for me had no way of pulling the engines, nor do they want to, they are machinists, not mechanics....anyway, I would go with the 454,better engine and great warranty...the only thing to check for is to get the one for your year or as close to it as they make, there were changes over the years, I bought a truck a few years ago that the owner had swapped in a new crate 454, only had 10,000 miles on it, I put that engine into my '73 Suburban,This engine was a gen IV , it did not have provisions for a mechanical fuel pump, so I have to run an electric one, that was the only problem I had,I run headers on my Suburban and my '74 pickup with 454's, the original exhaust manifolds always crack, because of too much heat and are very expensive to replace, I have had good luck with headers,except I have to put heat covers on the spark plug wires where they are next to the headers/ heads, bought the silver cloth ones from summit, they help protect the wires pretty good....hope this helps