I think Alm posted a great overview and ballpark on the previous page.
One thing that a lot of people here looking into doing this on a budget are missing out as far as doing this swap is that it can actually be done for almost $0 or no cost out of pocket. How you ask me?
I am just going through the same motions, and so far, out of pocket I am expecting to spend between $400-1000 if I go with very fancy gauges.
Basically my suggestion is to buy a complete runner car, 99 and up Camaro\Firebird, and part out the car. Sure it takes some work, but will put you way ahead. Yu can find them in the $3-4K range or even lower for salvaged or cars that had damage to the body.
In my case I bought a complete Camaro convertible, t56 manual, and parted out the car.
Sure it takes at least a full day to part out the car completely, plus whatever time to take pics, list the stuff on craigslist, etc however you will come way ahead, plus have extra parts you can use on your build, or sell to further offset the swap cost. In my case, I am utilizing the stock radiator and fans, tranny, engine, and the LS1 sized big brakes. Some may even utilize the interior to update their cars, seats, even dashboards and gauges are becoming good swaps on first gens
I parted out the car, sold seats, axle, subframe, interior panels, body parts, and finally body, and passed break even and some funds left, plus still have several parts left I may use, give to friends or sell to further offset the swap cost.
Getting a complete car has several benefits. You are not buying an engine or tranny with more doubtful past than from a yard, can get to hear it run and possibly even drive it, and In a nutshell, if you do not take into consideration the time to part out and sell the parts, what can also be a fun and gratifying experience it can be done for free
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