... each cymbal calls for 2 .47 uf cap's...
... i get .44. I have read that this will be within tolerance's in most circut's so i could use these in place of a .47 cap.
I think you are right. There is no problems with changing slightly the capacitance in this part of circuit. Maybe slightly more than .47 is better than slightly less, but it could be easily changed in the future.
Where i see a difference is in the internal capatance's of the tube.It seems the 6h30 is slightly higher in spec.Does this matter?I
I don't think so. The schematic of the amp is rather rigid, so you can easily do tube rolling.
I wonder is there a program you can model a amp like the cymbal with a different tube? Something that will tell you if a resistor or cap value need to be changed?
I don't think there is a program, but if you have specs you can find the right values by himself. In reality usually the values get by trying in the circuits different resistors and capacitors to get the best result (around the common values of course). I don' know where to find the theory in English to give you a reference.
I also wonder if i do get it to run what do i bias it at?) like a 6h30?
I don't think you will have to change anything. I think it will be good "as is".