I have a small budget but considering I don't need to come out of pocket to buy the heads I'm sitting pretty good.
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I would suggest that if you are going to do something that you go with a rebuilt set of the 71 4v closed chamber heads, ported and with one piece stainless valves.
I agree the iron 4v closed chamber heads are the ones to get, but they will make your brand new headers obsolete as the headers i imagine will be to suit 2v ports, The 4v heads will also make you new Airgap manifold obsolete as it too is for 2v heads.
Given you are on a budget and engine rebuilds have a habit of going out of control, a reconditioned set of Aussie 302c will give new new heads pretty cheaply, they will give you new valves and springs, they will raise the compression to 10:1 even with your existing pistons, you can utilize your new headers, you can utilize your air gap inlet manifold, you get new head gaskets (ie: fix the water leak) and you'll be up and running again pretty quickly and with not too much expense.
With the cam, i'd use what you have got, but with the thought that if you by a new timing set you can reset the cam timing 4 degrees advanced so the cam timing is straight up (0 degrees). That will improve the cam quite a bit and give you a new timing chain.
Then all you need are some roller rocker arms. Chuck the old ones in the bin. There are some reasonably priced sets around that will bolt up to the 302c head's rocker pedestals without any mods and if you look hard you may even come across some that are 1.8:1 ratio rather than the standard 1.73:1, that will open the valves a fraction further without a cam change.
With these few things done you can drive your car around while you plan and save for the big engine build, because believe me no matter what you do now in 6 months or a year you'll be saying: Mmmmm...i wish i had done this or i wish i had done that or i wish i had used this part or that part, or i wish i had got a new block or what ever ect.
For you it sounds best to do a economy fix up now and plan for a more coordinated engine build from scratch for later on or i can see you spending $5000.00 now and in a year second guessing yourself.
Then again i might be completely wrong ??/
