Probably the first question to ask yourself is how much money (and time) do you want to put into your project. Believe me, if you plan to spend $3k, you'll end up spending $9k. I've got a 75 that's about 70% complete, and I expected to spend no more than $10k to have a nice driver. Not special, just nice. I just broke $21k and there's still a few things needed. If you have an unlimited budget, lots of time, and a good selection of tools, do an LS1 transplant. If you're more sensible than some of us, then go with the LT1 or even an old TPI or TBI. These cars are so light that you'll get all the performance you need, and you'll still get the head turning that comes with a V8 Z-car. Beware of the 'One more thing" syndrome.