Finally, my first 360 and goals for it! I'll be asking a lot of questions.

I'd reuse that 270S grind in the 360 with a 9.0-1 / 9.5-1 max ratio.
I'd also reuse everything else I could from the prior engine. The LD-340 & the carb you listed will be great up top.
Thanks Rumblefish. You have answered plenty of my questions in the past too, thank you! The 360 I'm buying comes with a complete valvetrain for hydralic, so I could go that way too. I just dont know what cam is in it today until I have it apart, or maybe if I can learn to use one of those degree wheels I've read about. Is that possible? it would be awesome if I could use the valvetrain and the Magnum cam from my 273 and still have a great street friendly torque motor. I have also looked at the Hughes Whiplash cam, but it is really expensive.