If you want to use one of those manifolds, and already have one or more, find heads that will work with them.
A lot of the current existing aftermarket heads modeled after the original Ford A3 head.
There are variations, sure and some have made the exterior of the head resemble the original iron castings.
If you have an A331 Torker already and matched your heads to it, run that, but it isn't likely to make any more power then the regular 4v heads and a Torker. That is a 500hp combination with a 750 Holley and does make 450lb-ft of torque AND runs smoothly. Been there, done that.
I ran the B351 spider both with the A3 heads and the B351 which it was intended for. Don't bother. It just looks cool. It's a waste of time. In both instances the engine was down on power. How much? Can't say, but noticeably.
You can mix and match for sure but to ask someone to predict what your combination will do is inaccurate to say the least.
Simplest thing for you to do if you want your iron heads is to get a Edelbrock Torker, bolt it on and forget about it.
Go look on ebay. You can find nice used ones for $100 to $150. Sell the manifolds that you have.
Even the Blue Thunder is a respectable performer.
If you are looking for a 800hp Cleveland then you have to go with different heads anyway.
ProStock 351c engines were making 800hp with modified exhaust ports with plates and .800" solid roller lifter cams.
What you are looking at is a 500hp engine. To go more, you need to go crazy with lots of dyno time and lots of broken parts.