[SteveGB21]

Much work will need to be done.

1) The coil springs for a Chevelle will need to be obtained. They have options such as V8, small-block and A/C vs Non-A/C.

2) A bigger radiator will be needed.

3) Wire lengthening or shortening.

4) Frame mounts from a '68 to '72 Chevelle/Malibu/El Camino.

5) Radiator hoses for the Chevelle (or the universal flex hoses).

Did a swap from a Buick 231 V6 to a Small-Block Chevrolet 305. These were some of the things I had to swap.

Luckily with the 250 L6, you won't have to change the fuel line. I would strongly recommend if your brake lines are shot to do it now while the engine is out of the car. On the belt system, are you using a serpentine belt? If not, try to get all the accessory belt drive in one buy. 69 and later SB Chevy's use the long style water pump. Most don't have the smog pump, but have the TCS setup for the 70-74. 73 used EGR. 75 used catalytic converters. Some things to consider. The wires may have the TCS. Check with state laws requiring emissions. Good luck on your project. SB Chevrolet's have many opportunities. You could even go with the LS series later on.

It doesn't bother me, but this may irk some Pontiackers. Since this was originally a Chevrolet powered car, nothing wrong with this swap. I did it on a 77 Buick Skylark. Not fond of Buick engines at all.