Replacing FAST EFI on HP 383, with what?

If you keep that cam that powerpeaks at like 5600, and you run the shift rpm up to 6600 or better, and you keep that wussy 9.7 compression ratio you're gonna need a 3500TC and 3.91s.
That cam needs 11/11.5 to make take proper advantage of those heads. Otherwise a well engineered teener is gonna make mince-meat out of you.
But what do I know. My 367 only goes 93 in the 1/8th. With a little tiny wiener cam

9.7 Scr, that cam,3.55s and a lo-stall TC will hold your engine back until about35 mph before it wakes up then it will scream thru the top of first gear. If you choke it by short shifting it at 6000 or 52 mph, then the Rs will fall back into the basement, like 3600 and you get to climb out of that hole again. So the heads just started working and then you pulled the rug our from under them. My guess is the heads were working for about 1 or 1.5 seconds so far. So now you're in second at 52 mph and 3540. And you're on your way to 88pmh@6000. So the heads are gonna pull from 5000(73mph) to 6000(88mph) Or another 2.5 seconds. (And in a speed zone you are very seldom gonna be in, I might add).

Without headers, your overlap period means pretty much nothing, so you can ditch those 68 overlap* and get a much smaller cam that has way more midrange power. Then pump up the cylinder pressure, and crank in some decent lift, and make those heads work all the time.I mean you paid for'em, you might as well make use of 'em.
But the 3.55s are still gonna be a bit of a handicap. But now you are gonna blow the tires away, so a bit less so.
If you you get the combo hot enough, you may not need any extra stall, cuz firstly the 185 psi is gonna push the stall speed up a little higher, and secondly, the 185 psi is gonna build more torque than the tires can stand anyway.
185 is waaaaay more than 150. different world.200 is something!
Here's my opinion
I bought aluminum heads to run the psi, cuz if I was stuck with 150psi, I'd have to pretend I had power. 150 is a waste of aluminum, and that's my opinion.150 is almost a waste period. Shoot I've built lawnmowers to beat that.