The thing you need to be most concerned with is finding out the true year of your donor block,in 1980 Ford 302's changed from the old 28 oz balance to a 50 oz balance if you mix up the wrong flywheel and balancer combination you will have a severe vibration which will be a "death knell" for your 302,click on this for help:The Ford 289 and 302 Engine Block It would be a good idea to check out buying some of these books on building a SBF 302.