Re: Rs/ss 350
Most likely no on the big cap HEI fit. Will be close. Maybe the car to car variance will be in your favor, or maybe you can get enough forward position on the subframe mounting locations as long as you can still get the fender gaps you want. But most times big HEI won't fit without a bit of firewall mod. And even if it just fits, it's got to be able to rotate for timing, etc.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!