Need 4-speed Help

I don't know anything about the depth of the scatter shield vs. a factory bell housing, but if there is too much space or too little space, what would that cause it to do?... If the tranny input shaft doesn't have a solid alignment to the pilot bearing and a proper seat in it, engaging the disc is to the pressure plate and fly wheel without it centering, would cause it to wobble, chatter, vibrate... It wouldn't be nice... With the engine off... Maybe you could (inplace of taking the whole thing apart again), turn the transmission output yoke (you may have to drop the drive shaft and might need another yoke if that's possible) with the tranny in 1st gear and slowly engage the clutch and see what you feel at the yoke and hear as you turn it by hand.... It would be a slow motion attempt to feel or hear binding or flopping... It may not show anything, may even be really hard to turn and work the clutch at the same time, but what's your alternative at this point, another disassembly... Maybe you can get some help from someone with this... But above all, be careful... If you have to take it apart again, I would suggest, that you 1st remove the tranny straight back without disengaging clutch... Then get a flash light and see if you can look (with a mirror depending on the space you have) into the bell housing in a straight line as the shaft would be and look at the clutch disc, pilot bearing, and throw out and see if it looks out of line, any signs of wear or galling of parts... Do this in a safe manner with the car properly supported and immobile, and with rear of the engine supported well... Also you might want to measure the distance from the face of the bell housing to end of the pilot opening and compare that to the trans shaft length to see if it all adds up... It's not going to be easy, but do it safely... I've been under my 67 about 4 times this week in 28 to 43 degree NJ weather outdoors to undo my shift pattern problems, buts yours is more complicated by far.... Be safe, be careful, be well, and good luck... And above all take all this with a grain of salt, if someone suggests something better or easier, do it......