If you don't want to pull the block, you could disconnect the motor mounts and rotate the block 45* to the passenger side. [But that's a hassle in itself.] The pushrods for Cyls 5 & 6 are not convenient.
I agree with Geezer, those cams are too wild for a daily driver.
I'm running a Crane Cam 260H, but Crane folded a few years ago, so no soap there.
It has 260* / 272* advertized duration, with .498 intake and .530 exh lift.
Notes state: '' 1963 - 1984 Cheverolet 6 Cylinder 292 cu in. Smooth idle, daily usage, off road, light towing, economy, also mild turbocharged.''
Have you looked on
www.cliffordperformance.net
www.12bolt.com ?