I've always liked those 041 clones with Rhoads lifters.
But, with reg lifters, you might like the Howards version. It has less adv duration.
https://www.summitracing.com/parts/h...w/make/pontiac
But, if you really don't plan to go over 5500, then the Crower 60243 should be plenty of cam.
https://www.crower.com/pontiac-287-4...m-284-hdp.html
Even a Summit 2802 should go 5500.
https://www.summitracing.com/parts/s...AagaAqTx8P8HAQ
But, with your exhaust flow, a single pattern might work well. There are lots of single patterns. I'm thinking there's no need to go over 230 degrees dur @ .050 lift, for a 5500 rpm redline. And, most say a 112 or more LSA will give more vac and a better idle. But, I'd say go at least 110 LSA. CC & Lunati make single patterns with 230 @ .050, & 110 LSA. Either of these should do what you want.
https://www.summitracing.com/parts/c...WoYaAjJC8P8HAQ
https://www.summitracing.com/parts/lun-10510471
The Crane 10508 has 228 @ .050, with a 112 LSA.
https://www.summitracing.com/parts/crn-10508
http://www.jegs.com/i/Crane+Cams/271...pGUaAuIo8P8HAQ
http://www.jegs.com/i/Crane-Cams/271/105082/10002/-1
I'm assuming that you realize one good 800 Q-jet, will probably be a better choice, as would 1 3/4" tube headers. But I also assume you have a reason for using those you listed. So, that's all I'll say about that.