Paul -
I would see little advantge in changing the L76 to run LS1 computer in a new install. A few guys have done it here, and from what I have seen, it is not as straightforward as installing it to run the normal standard L76 ECU with fly by wire throttle.
The L76 with a cam and valve springs can get very impressive numbers (ie. 300 rwkw), and for a crate engine Ive seen advertise for as little as $4000 - it has to be the performance bargain of the millenium. Yes there are a lot of add ons to get above the engine (loom\computer,alternator etc etc) but even with that it works out great value. As youve probably seen, there are a lot of places offering engine\gearbox\addons packages - and haggle. ONnce you get all that, youll still need to get your harness reworked (Sideshow can do that) and your ecu programed and then you should be off and running.
Cheers
