I have a delema, I have a 502 just sitting in my shed, and I got a 305 in my blazer that is a dissapointment to say the least. If I put the 502 in will i start breaking parts and have to replace my drive train? I got a "friend" that wants to trade me a 350 with aluminum heads and approximately 400 hp, install and give me 1500 in cash. What should I do? I am leaning toward the 502 but I dont have lots of part money. The 502 is rated at 450 HP and 550 torque. It is a marine engine and has not been used before.