Slant six to 360 engine swap list?

The car originally had a slant six in it. I think someone put a v8 k frame in as an after thought and never put a v8 in. I have stock exhaust manifolds already. The 360 is hooked up to a 727 transmission.

I thought I'd need a new fuel line and sending unit because it is originally for a slant six engine and therefore smaller diameter.....right?

What about beefing up the torsion bars and suspension, or replacing my stock 7&1/4 rear end?

Thanks.