I can get a 1976 caddy 500 big block and tranny for $450.00 but I think I saw on the internet that this motor only has 170 horsepower.. Is that right? That just seems crazy to me. I can also get an 454 cast number 14015445,(top right side)D84,(middle)H1-P5R PA88F4 the 88 on last number was unclear could be slightly different. that is sezed from over heating. he said that he took the oil pan off and there was no metal shavings and that it is a 2 bolt main. Is either one of these worth getting??