Hello all, I have acquired a 1967 427c.i. motor, casting number 3869942 which has 2 bolt mains from a passenger car (short deck 9.8"). It is a complete motor with closed chamber, rectangular port, cast iron heads from 1968. I have a few questions for you guys: 1) Can this motor be stroked to 4.25" and bored 0.060" over to make it a 496 c.i. motor? 2) What is the maximum compression ratio that can be run with the heads? 3) Am I wasting my time with this block and head combination, and if so, what is a better combination that is affordable? Thank You!