What are the differences between these motors ?I Bought a 78 Grady-White with a bad motor. On advice of .a mechanic friend I got a 250 chevy motor out of a 76 truck (which we heard run)swapped all the parts.(easily interchangable)sent the head out off the merc, everything is now ready to go back in the boat and...I start hearing I can't do this...boat friends are telling me cam,connecting rods,bearings are way different..Have I been pouring money in the wrong whole?..p.s. This was all done for reasons of economy..I also had to rebuild the interior of the boat ,floors, floatation,fiberglass..
