Need help with vibration in new motor!! (5th gear shimmies) PLEASE HELP!!

[skiwesser]

Okay, stock block .030 overbore, new eagle rods, forged K.B. pistons, Trick Flow #1 Cam (221/225 dur. @.050,.499/.510 lift), AFR 165's, Typhoon intake (port matched to heads),73mm C&L meter, 24# injectors, 65mm TB, 1 3/4 longtubes w/3 chamber F.M. cat-back. T-5 in good shape for now, will a tremec bolt up to a stock bellhousing?

OK, the problem is that in 5th gear (most notable, I can feel it in 4th sometimes too) at low RPM's 1500 and under if you ease into the throttle the shifter shakes to the point that I have too gear down, at first I had NGK's in it and it really shook, went to 1/8 mi. track and ran 9.01-9.06 all motor, 8.85-8.89@ near 77mph on 60 shot of gas, which only picked up 1.5-2mph trap speed, I knew somthing was wrong so I only ran a few times and on the way home it was hesitating and sputtering of fouled plugs.

Swaped to autolite 3923's and new cap and rotor and wires, and it helped a lot, now it only does it I'd say 50% of the time otherwise it's smooth as silk when I accelrate at even 1100-1200 RPM's in 5th.It goes back and forth about every time I drive it.

When it's running with no vibs it seems to have quicker throttle response & or quicker accelation. I have a crane ing. and blaster coil, but it doesn't matter if I unplug the crane box or not.

Fuel press. is at 40#, 24# injectors

ANY THOUGHTS?????