Just Curious

the 302 and 351W are almost identical if you have a complete engine assy. The tranny may not be the same though unless it came out of the same car. But you can bolt it up to your existing tranny.

If your going to alter from stock you'll probubly need more radiator, but stock you should be OK. Also depending on what the 351 came out of make sure the water pump fitting is on the same side as your 302 or you'll have to get a different radiator. You can't use the brackets from the 302 on the 351 so you can't just swap the water pump to the opposite inlet.