383 or 5.7 hemi

I have a run of the mill 67 fastback, nothing special just a 273/904 both of which need a full rebuild. I am planning on a 5.7 with 545 swap. If your car is a super clean example I would lean toward keeping it as it is. If it is like mine which needs lots of work, might as well well make it my own. That's just my opinion though, YMMV.