@panteradoug The shop doesn't have the dyno at their location. The engine builder has the dyno. I most certainly have not said "no" to any part of this project. I am into this well over what the car is likely even worth, and I'm not really keen on cutting corners on it. I've insisted on the dyno and we're trying to get a date for that now.
When you say the flanges need to be 90 degrees in relation to each other, do you mean the flanges on either side of the gearbox? Or do you mean the flanges need to be 90 degrees in relation to each other from the gearbox flange to the axle hub flange?
@racecarmike I've asked for exact part numbers for the flywheel and harmonic balancer that was installed, but the shop did tell me the flywheel didn't have weights on it. The harmonic balancer, I'm told, also doesn't have any weights on it. The engine is the Ford Boss 427F short block with a complete rotating assembly and internals already installed.
Short Block: https://performanceparts.ford.com/part/M-6009-427F
Heads: https://performanceparts.ford.com/part/M-6049-Z2
Ford wouldn't provide an assembled motor entirely, I'm told, due to liability. I did go with a Jesel valve train on those Z2 heads, but I can't imagine that would cause the vibrations we have now.
The vibration that I get feels like a harmonic, rather rough hum that goes through the car between 2000-2500RPM. I just tested the car a moment ago in the garage and it does this in neutral, parked, when you run through the 2000-3000RPM range. It starts at 2000, gets progressively worse until 2500 or so, and then starts to go away the closer you get to 3000RPM. As it gets closer to the worse spot, the rear view mirror is basically reduced to worthlessness.
I don't think I'll focus much on the transmission side of things yet, as this appears to be more related to the engine. I think I'll spend my lunch break verifying we actually have the correct firing order just in case someone's crossed a plug wire that shouldn't be crossed.