Hi everyone. I'm looking for some insight on what all there is to consider in swapping out the frame of my 1967 Bel Air to the early 2000s trailblazers and gmc envoys. It came with the chevy 250 inline 6 engine and id like to keep the modern equivalent which those suvs carry. I know I'll have to lengthen the frame from 113 to 119 inches to match the wheelbase and have the driveshaft lengthened but not sure what other headaches I should expect to encounter.