I think the bright orange sounds good, it'll be a little different from the usaul red, black, blue colors (not that I have a problem with those colors, some of my favorite colors!LOL), maybe have some yellow stripes, the black wheels sound like they would go good with the orange. As for the RG engines, I have a few of them & have had only minor fit problems, nothing that a little sanding won't take care of, the worst thing I've had was on the 815" P/M Ford engine I bought, a little prob with the upper oil pan fitting flush against the engine block, just sanded down the sides on the block till it fit better, haven't had any probs with the RoadHammer Hemi or the 815" Next Gen Semi-Hemi that I got.
The fitment problem you described was the main problem I had with this one. Same exact spot. I did the same as you a little filing her sanding there and it fit like a glove. Just between that and the few other fitment issues it seemed excessive. like I said I have done a few of these in the past nothing cast with this much "room for adjustment" if you will lol. I made it work cant complain I suppose. and besides after its all done it is going to look bad a%$, Thank you for looking dragracer I do appreciate your time.