498 inch motor with solid, but smallish heads.
I would use the cam Hughes recommended 260/264. On that big of motor, it will be mild.
I ran a 260/264 Howard on my 10 to 1 stock stroke 360 street strip deal. Ran 11.20’s with heads that went 255 max
Would probably also consider a 9.5 inch 4200 flash convertor, or a very tight 4200 flash 8 inch convertor. Either should work very well on a street strip deal. Oesnally like an 8 inch better. Get an adequate tranny cooler and have fun. Big mistake people thinking an 8 inch isn't streetworthy
Your car will run well into the 10’s falling off a log. I would like the single plane on that motor were it me, nothing you do is gonna not make it a stump puller.
Like the 3.91 gears, but i suspect the car would run probably much the same with 3.55 gears out back.
With that cam and intake, would think 600 horsepower wouldn't be a huge stretch for it to make, certainly 575 easy.
Good luck, sounds like fun. Assuming a typical weight A body street type car, sounds like 10.60’s to me at 126 ish