I have a 1974 Chevy C10 step side. It has some year of 350 in it with a TH400 transmission. I want to get better mileage and smoother operation and quicker starts, as well as less pollution so I want to go with a drop in Multi Port Fuel injection engine when this engine gets tired...or I just decide to change it. So what year of 350 engine would bolt up with the least hassle? (I don't mind wiring, but I would rather not change location of motor mounts and transmission cross member and such if possible). Looking at maybe something with a Vortec head on it and I could do an after market MPFI setup. So what years would bolt up? Thanks for the reply!