72 Demon starts bogging sporadically once warm

Hey all, I’m pretty new around here, my wife and I just picked up a 72 demon that the P.O. set up for the track and street. It has a mild 360 with a lunati bracket master II .480 cam in it, Edelbrock performer intake and headers. 727 trans with a 4,500 stall. 8 3/4” rear end with 3:91 sure grip (I believe from dr diff). It has an Edelbrock 17301 electric fuel pump. I took it out 3 times yesterday, first two trips were short around town rides maybe a total of 5 miles each. Temp stayed at 180 the whole time and it ran great no issues. My third and final trip was alittle longer, maybe just a few more miles. I was cruising at about 40 mph going down a mild grade hill when I noticed the car started to bog down. I didn’t change the accelerator pedals position, it just started to bog down. I kept it in its same place and it cleared up and regained full power a few seconds later. It ran okay for about 15 seconds and bogged down again in the same fashion. I pulled into my destination which was right immediately after this happened. Let it sit for about an hour. It fired right back up, didn’t seem to have any issues. Temp was around 150. I stared to climb a decent grade hill immediately leaving the parking lot going about 30 mph. It started bogging again. This time it ran full power, then bogged for a good 20 seconds, cleared up, then bogged again for longer. I got out of the pedal and it cleared up, only momentarily this time. I tried to gain speed again and it gave me power but only for a second or two then bogged really bad. It got to the point where I would get off of the pedal it would idle, then I’d try to gas it and it’d bog. Repeat this for about a minute with each bog getting worse. It then died on me. I coasted it off the road, called for a tow and waited. After waiting about 10 mins I restarted it. It fired fine. It fully revved while in park and neutral, and never bogged or hesitated. I checked the fuel pressure and it was sitting at 5 psi. After letting it idle for a minute it dropped to 2 1/2 - 3 lbs. If i gassed it it would drop slightly lower.

That’s the big picture of what happened yesterday. Does anyone have any idea what happened or what it may sound like??

Today I changed the inline fuel filter under the hood and re-grounded the fuel pump ensuring it was grounded. Ran a fuel pressure test again. Cold start it sat at 7 1/2 psi. Once warm to 170 degrees it dropped to 4.5 - 5 psi. I held the throttle in just a tad (unsure what rpm as I was in the engine compartment not the cab) and it dropped to 2 1/2 psi. When I let it go to idle again it was a slow climb back to 4.5 - 5 psi. The fuel filter also look low in gas but then started to fill back up to about 1/4 full slowly.

I know that’s a book, but any help is greatly appreciated! Thanks