Just for alittle personal info, could someone give me the specs on a factory 400cid sbc for a 1976 K5. ??? Compression, HP, Torque, ...ect. 400 4bbl. , I haven't yanked the pan yet, but I'm assuming it's a 2 bolt main. What's the possability it could be a 4 bolt main ??? If it is a 2 bolt, do you think this would be a good idea ??