Present mods:
-Buschur exhaust (no cat)
-Boost controller (19 psi)
-S-AFC
-GFB BOV
-grounding system

How much hp would I gain with just the TT reflash?

***All below include with the TT reflash***
How much do u think I would gain with HKS 264/264 cams?

If I got the cams, should I get cam gears, and new headstuds, and walbro fuel pump?

 

You should get the fuel pump.

With those mods and cams you would be about 330. How much you gained will depend on how well your AFC is tuned. You will get more torque with a flash though.

 

Ok, well how much hp would I have with my present mods and the TT reflash?

If I got the cams should I get cam gears and headstuds too?

 

IMO, cam gears and headstuds won't do anything for you especially with 264s. With your current mods you could push around 300. These numbers are all +/- 10 HP, BTW.