Only two V8 heads?
When living with my parents, in my bedroom I rebuilt two Triumph twin engines, a lovely desmo Ducati engine and a complete BSA B15, although the wheels had to come off to get it down the stairs.
The trickiest job though was the gearbox from our Cotton Telstar. The previous owner had asked his mate to overhaul the engine, but not touch the gearbox. This was said as he left Brands Hatch in an ambulance.
I was later presented with a cardboard box which contained most of the gearbox parts.
What a nightmare.
Everything was on loose needle rollers and would only work if accurately shimmed, so I'd assemble, find it didn't shift cleanly and as I disassembled all the rollers fell out, along with the shims.
Start again from scratch. Arghh
It wasn't wise to cut corners and just busk it because if you forgot you were in top and shifted up this box could shift 'up' to first and lock you up.