rebuilt stock 904 - manual valve body?

[GoodysGotaCUDA]

I have a stock rebuilt 904. I'd like to get a manual valve body for it. It has a 3000rpm stall, low gear set in the trans, and 3.91s. Does anyone foresee and issues with putting a manual valve body in a stock rebuilt 904? It would be a low band apply vb.

Also are there any things you 'cant' do as far as shifting with one? I heard that you cant downshift (say 3-2) and let the motor slow the car. Not that i do this, but on occasion in hard braking ive had to downshift to help slow up...So is there anything i should be aware about?

Thanks! 

[deathcharger71]

nobody has answered yet so im gonna ask my question too and get this topic back to the top  so heres my situation...ive decided against the 727 because it doesnt bolt right up like i orginally thought, and lets face it i dont have a 440 ground pounder so a built up 727 might be overkill for me. so my choices are 904 and A-999....a shop near here has an A-999 and quoted me at 800 bucks to rebuild it and install it, plus another 160 for reverse manual valve body. or i could save eve more money and rebuild my 904, my question is what can i do to it to make it tougher since i will be abusing it? or is the 904 just crap and i should got with the A-999? i will be running a 3000 stall, 380-400 hp 360 and i like doing burn outs 

[deathcharger71]

do 904 shift kits and valve bodys work on the A-999?