Mate
Looking good. I went through a similar build not so long a couple of years ago with my VK Calais. I like your rotisserie. I tipped my shell on its side on a couple of tires. Did the trick.
I used a LS1 with cable operated throttle body. One less issue.
I offer you the following advise. Before you paint set the engine up in you bay to check clearances with the alternator, extractors, steering rack and brake booster. The AC compressor will not fit in the original location.The tunnel will need a massage to accommodate the reverse lockout solenoid on the box.
I used an alloy V8 radiator and twin thermos that are advertised on eBay. The ones advertised now are a bit different. Used a ED falcon six top hose. I replaced the thermostat housing with a straight one. The original one points in the wrong direction.
I have had mine recently engineered. It has been on the road for the last few months and I am very happy with the performance and reliablity. Well worth it.
Good luck with yours.