I did the middle of the road swap..LT1 T56. No custom mounts, no custom oil pan, no custom exhaust, modded factory 4th gen wiring, even found a bolt in driveshaft. Parted out a wrecked 93 z28 and the swap ended up costing me about $500 for misc parts, the actual engine/trans/radiator/fans/wiring/ECM was all free after parting out the car. Gets over 20mpg and the starts/runs flawlessly. It does not have the power making potential of an LSx engine but I built it to be a reliable drive anywhere car and ultimate HP was not the goal. I am now in the middle of doing a 70 chevelle with an LT1 4l60E, another very low buck spent project.