Ok well I have my engine built and going from a 250 w/glide to a 350 w/th350 short shaft. I have the new mounts for the block and got a new trans poly mount. but do I need anything for the frame mount? and will the drivehshaft be ok?
Don't worry about changing the springs unless you need to anyway. The small block doesn't weigh that much more, and some of the 6 cyl spring rates were actually stiffer than some of the V8 springs.I would wait until your swap is done and see what your height/handling and ride quality is.