Efi may pick up a few ponies but it's more for reliability also Maybe take a look at trick flows dyno on there 440 they made 620 with a near same cam, there's was hydraulic & .600 lift.
It's probably going to be cheaper to find a couple hundred pounds to remove first. Then go run your set up. To me yours sounds like a mid to high 11's. I might ad if your looking to run pump gas & have fun, & basically smoke 99% of cars on the road your already there. With the bigger cam you'll run out of air with the head & intake.
1 of those change one, change all scenarios & you may need The added compression to run a bigger cam & everything be happy. If you have enough aluminum in your engine compartment & can stay cool you'd be fine @ 11.0:1 The rods if your serious about even 550 hp I personally would oust them for an h-beam. Hope this helps, but to make clear your car sounds like a good street strip set up already. Best money spent would be add some cubic inches that makes everything easier. 512-528-543 but no more on a stock block...thats all just my opinion & stuff in my head I've picked up along the way. Also going low 10s you've gotta have more stuff done to your car then an 11& up car I believe
