|
I don't think stiffer springs may be in order. The 351 has a 1 inch higher deck height (and bigger crank) and is a bit heavier, but no more than about 50 lbs or so. Some of the weight gain could be made up by using an aluminum intake. The 289 intake will not fit the 351.
You can still use the original exhaust manifolds but they would sit almost an inch higher and slightly wider apart so the original exhaust might not bolt up.
Use the same flexplate or flywheel that came with the new engine. Some of the 351's were externally balanced while your 289 was internally balanced (I think) so the housing may not interchange.
If the 289 was a manual and the 351 is from an automatic, you may not have a clutch pilot bushing in the rear of the crank. This may be a problem.
Finally, check hood clearance with the air cleaner, as the 351 is a slightly taller engine.
|