constantly changing clutch noises?

[DRCprojects13]

So I just bought a 91 240sx se hatch, great body and interior, rebuilt engine, spec clutch, it just needed some mechanical work, no big deal right?...WRONG. I put new motor mounts in, new thermostat, belts, then the day I registered it, I heard a clanking sound from the back of the engine when I started it. and a whizzing sound after I shifted. So I thought it was the throw out bearing. So I took the trans out and replaced the throw out bearing, although the bearing didnt look that bad and the clutch looked pretty good. So I put it back together and noticed the starter bolt mount was broken off, so I thought maybe the starter was bouncing off the flywheel, so I replaced it. The noise was still happening but only til the car warmed up, then it went away, so I took it for a ride and it only made that whizzing sound after shifting over 3700 rpm. My uncle who is a mechanic thought it was the heat shields, so I yanked those off and that noise went away, but now I hear grinding at low rpm and during shifting. im thinking it might be the pilot bearing. anyone have any ideas?

[johnnyballs180]

are there any more sounds other whan the whizzing sound still? i would lean towards pilot bearing, but if the sound goes away when the engine's warmed up, then that's a little weird to me.

[johnnyballs180]

i may be very wrong.

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