You will be better off to just buy a complete engine out of an 86 or 87. Your standard block V-6 will not have a hole tapped in the front for the turbo oil drain line and it will not have the same crank as a turbo motor... About the only thing you could use would be your bare block and you would have to drill the hole in the front for oil turbo drain line as mentioned above if u used it.. A few other things to consider would be the engine wire harness and the computer which would need to be changed out as well..A buddy of mine just bought a turbo motor complete with everything. Headers, turbo, computer, intercooler etc... Honestly unless this 81 Regal was in pristine condition and you really want a project you would better off to buy a 86/87 turbo Regal. The prices are as low as you can get right now if you have a little patience there are always alot for sale....