i have a 98 12v with 194k on motor, i bought a motor from a wrecked 89 with 80k on it. im building the motor slowly in the shop on my free time, im doin cam, injectors, turbo, hd push rods, 60lbs springs, gov spring with the p pump conversion, port polish, 3 piece mani 3 angle cut valve any way was wondering if there was ANY down grade in the first gen block? diff size or dishes pistons? anything different in the heads? and am i able to run the new oil fed vaccume pump? thanks