Not a very good narrator, but here goes...
Started with a junk block with oil pan and TH350 trans for basic mock up. Set the engine in place or at least where it fit best and made the motor mounts. (I like to tinker with stuff like that) Made a plate that bolted to the engine and one that bolted to the truck's motor mounts, measured the distance between them and welded in a piece of 2x2 tubing. Yes it is hard mounted, but it works. With a floor jack under the tranny pan i measured up and modified the stock trans mount. Whew...so far so good. Tried to remove the engine and found it quite difficult due to the depth of the oil pan in relationship to the cross member. Easy fix, remove the cross member. Close but no cigar. Check internet...idea...remove the core support and trim back the radiator mount to the width of the block. Oh look, the engine and transmission now just slide straight out. Woohoo!.
Got a wrecking yard engine from a '99 Silverado for like $950. Came with harness, CPU (computer) exhaust manifolds, O2 sensors, fuse box...complete swap out set up. Sitting on the pallett it was a mess of wires and holy cow it looked huge.
Followed the rewiring tutorial from:
http://lt1swap.com/wiringharness.htm That guy rocks! Thought of reworking the harness was gonna be overwhelming, but turned out to be fun once I got a feel for what was needed to make the engine run. Send the CPU off to the author of the article, was leary of that, but that guy was amazing!
OK, now I have a reworked wiring harness, flashed CPU, and engine that ran when pulled. Pulled out the mock up block. removed the transmission and joined the trans to the new engine. I used the adapter collar spacer thingy to go between the torque converter and flywheel. Start to slide the unit back into the truck...Darn...exhaust manifolds are not gonna work. Pull engine again. to be continued.....