Wiki says that Loveland is about 4800 ft elevation, that's gonna be a downer.
Doing the math;
If your 318 is an LA with a true deck height of 9.600, those piston-tops are still gonna be .012 in the holes.
This, at 020 over, is 2.4cc, add
the dome/ eyebrows, -6
the for the heads 72 and
for 039 FelPros 8.6
this totals 77cc, and so your 318 comes in at about
(658.9+77)/77=9.56 Scr. The quench is gonna be too tight
So the bad news is that even with the stock 318 cam (Ica of 48*) at 9.56 Scr, she's only predicted to put out ~150psi.
By the time you get to two sizes bigger, a 262/266/110 cam, (Ica of 60*) the pressure is down to ~134psi, so, at 4800ft, about as powerful as the stock 318 is, at sealevel, until the rpm gets up to around 3500. aaaand yur still buying a convertor and probably gears.
IMO with that 318, at 4800ft, to run a 262 cam, the Scr is gonna need to get up to around 10.7, and that would be a total chamber volume of 67.9. And that's gonna take closed chamber heads, and pistons with no quench pads!
So, IMO, yur stuck doing one of three things
1) with your plan, a really small cam, milled pistons, and a convertor, or
2) as above but in addition; slightly bigger cam and gears
3) buying closed chamber heads and other flat-top 318 pistons, and maybe a convertor
4) buying a 360 short with Q-pads to slide under your open chamber heads, and running whatever convertor and gears you already have.
As to #4; Hint:
KB makes some nice KB-191 series Quench-pad pistons to work with the open chambers, to make a longblock with enough Scr to run just about any street cam you could think of.
4800ft is a bit of a downer.