Making the most of what I've got

[KiltedBanshees93GT]

I've thought about getting a new converter, the t-5 plan is still kinda far down the line, considering the other projects in the near future (suspension needs a rebuild something fierce). A converter might be a good stopgap. I'm not sure what a good speed for it would be tho, its supposed to stall about 200rpm lower than the powerband, right? So something like a 2300-2500?
As far as tuning goes, I agree completly, and that is something that I'm still learning<g>
I am planning on gears in the near future too, but the only concern I have is that the car would wind out too fast. (this is where the 5 speed would come in)
I've heard that early 70's 351w heads are a nice "budget" upgrade, what specifics should I look for in the head specs for this engine/combo?
The exaust is a GT dual setup with gt trumpets and flowmasters.
What would be the highest rpm a non hi-po should go? The car was originally a 2barrel "c" code. Ive been paranoid of overreving it since I got it.
Thanks for the ideas.
J