Welcome to CHR!

Hope your stay here is long and that you find the answers you’re looking for. The heads you mention are actually decent in their stock form – used on a lot of high performance Chevies including the legendary 290 horsepower 302 as well as the 350 horse 327. When you say “pocket ported” I hope that means at a machine shop by someone who knows these heads as you can find water real easy if you don’t exercise caution. I hope you also had the heads surfaced as their age almost certainly would require such to get them perfectly flat. A couple of questions:
1. What block did you start with?
2. Did you have the block decked and do you know the final measurement (Stock would be 9.025”)
3. Are their valve reliefs cut in the pistons? Do you have a manufacturer and part #

Before we can help you select a cam, it’s critical to accurately determine compression. If you ask Techinspector1, he will provide a very detailed explanation of how to determine your static compression ratio (SCR) which, along with the rear end gearing, transmission info and weight that you’ve given us, will assist in a recommendation. You want to be in the 9-9.5:1 with these heads to run pump gas. As much as it pains me, much more with iron heads (on today’s gas) is just not practical and you’ll be subject to detonation that can wreak havoc with your new engine.

Hydraulic flat-tappet can be fine as long as you assemble with good lube and follow break-in instructions exactly. Use Brad Penn’s oil - it's is a good one.

Most here will tell you that you do not want a “lopey sound” as that’s evidence that you have picked the wrong cam. I know, people might tell you that, “it sounds cool” but those who know engines just smile and shake their heads – knowing that your engine is very inefficient. Better would be a cam that makes your car pull like a mule to 5500 RPM and still idles with enough vacuum to operate your accessories.

Torker is the wrong manifold – Performer is better but if you could e-bay both and get a Performer RPM it would be ideal. The Performer RPM matched with a well build and tuned Q-Jet would be a monster and a kick in the pants when those huge secondaries open.

Good luck and once again, welcome!
Glenn