Heads Help!

I think if it was me I'd still minimize the expense on the existing heads. If the exhaust ports are still open, you're not running headers - correct? I would look at a small solid flat tappet cam that will give you decent area under the curve but not require big headwork os rpms. Buy a decent set of headers and have a good exhaust connected to them. Then buy some brakes. Then when you've maxxed that out (good move on the transmission BTW) you will have a decent platform to add some power to.