WOW, that's a lot of kinda hard parts to find. Harmonic balancer nut, flywheel bolts, 3 head bolts
pressure plate bolts.... should be replaced anyway. But you'll need the old ones to make sure you're getting the right new ones. They likely "walked" when somebody needed a bolt or 2. Sounds like an employees' buddy was working on a jeep!
dual plane i didnt have any problems with 150 hp shot.........one thing thru the years running nitrous the engines respond a lot better to low rpm shift points....on the engines running 7000 rpm N/A...... with nitrous ran faster and more mph at a lower 5500- 6000 rpm shift point......