I think the intake bolt holes can be re-drilled to the correct size and angle. If someone knows the correct angle and size, I'm sure that any competent machine shop could redrill them for you.
Yep is to re-drill and offeset the angle, dont dont get crazy only so much HP in a 273 do to small bore size etc. Yes you can make it run, been there done that, but for the $$ a 360 or 318 is a no brainer..