<VV> 4 spd trans trouble

[judynrandy at comcast.net]

I've just completed the installation of a 4 spd in my cave car.  It was to be finished tomorrow.  But now, the trans is not co-operating.  It's a '65 4spd coupled to a '63 3:27 diff.  It has a new bolted flywheel, new throwout bearing,  and new clutch disk.  The car is still up on jack stands. When the engine is off, it goes into all 4 gears and reverse.  Earlier, in the week it shifted through the gears fine with the engine idling.  Then, last night, it all-of-a-sudden started NOT going into 3rd or 4th, or reverse. 

   With the engine idling, I start up through the gears.  If shifts normally into 1st and 2nd, but a fter many tries, it stiffly (if at all) goes into 3rd, and sometimes 4th.  It wouldn't go into reverse at all.  After letting the clutch out after getting it into 3rd, it sounds like someone dropped a marble or two into the tranny.  Then, on the rare occasion it went into 4th, it really sounds like someone dropped a couple marbles in it. (Gets louder) 
   My question is this: what the hey is going on?  Ideas and opinions welcomed. 



Randy (Cap'n) Hook 

'60 700 4dr 84/ dead (for now) 4 spd 

'63 ragtop 110/pg 

'65 monza 4dr 84/pg