One of my favorite 327's I owned was the L79 that was in my 1966 Chevy II Super Sport. It came with a 327/300hp, but 3 months after buying it, I went to the local Chevrolet dealer & placed my order for a L79 crate engine, & that turned that little SS deuce into a consistent 12.9 second 1/4 mile little animal with a 411 posi 12 bolt, & just as importantly to me, since I ran it on the streets back & forth to work every day, It Was One Of The Most Reliable Engines On The Street & Strip That I Ever Owned !!
This motor did not get the credit it was due, since the solid lifter cam 365 carbureted or 375 hp fuelies got all the well deserved recognition, but all three were basically the same engine. The L79 shared the same forged 11.1:1 pistons, 585-cfm 4150 series Holley four-barrel, aluminum dual-plane intake manifold (except for the fuelie), enlarged 6-quart oil pan, high-flow air cleaner unit, and big-port camel hump cylinder heads, with 2.02/1.60 (intake/exhaust) valve heads, just as the big brother L76 engines. The difference was the hydraulic lifter cam in the L79, but it didn't require the frequent valve lash adjustment of its more potent L76 big brothers with their solid lifter cams. The L79 actually had 10 lb-ft more torque than the L76, even with the 15 hp less then the carbureted L76.
If I remember correctly the L79's cam lift was around 0.450/0.450. You should be able to find all those L79 specs on the internet somewhere, or your engine guy may have them too. I know I have them out there in my shop, somewhere in the cobweb section.
I'm assuming you're not going to run high compression 11.1:1 pistons, so if you go with 10.0:1 pistons you can run 91 octane pump gas, & If you build it to the rest of the L79 specs with it's hydraulic lifter cam, you may hit that area of around 300 hp you're looking for, plus with running a hydraulic lifter cam, you can enjoy Air Conditioning in the summer. AC & solid lifter cams don't do well together, at least that's why GM never offered AC in any of their factory solid lifter cam engine cars, whether it was a small block or big block.
I'm curious to find out what your new engine find is. If those camel hump cylinder heads were factory installed, it could be an old factory L76 or L79 327 ??
Best of luck with your new project !!