Been there done that (not with a Hellcat), I put a '92 302 roller (350 HP) in place of the original 289 in my '66 Mustang. i was told this would be a good fit.....I have 1/8 inch to the frame on one side and 1/4 inch on the other side. My point this is not as simple as some people say. Also, the nice new EFI, turbocharged engine MAY need some electronics not in your existing car. This is where I made a mistake, I went with a carburated engine instead of the EFI as I did not know what I was going to get into with the ECU.
Also, I added sub frame connectors (Mustang was unibody construction) and welded these in place, added touque boxes, monticarlo brace, etc., since I not had almost twice the normal horse power. Brakes were converted from front disc rear drum to 4 wheel disc, and the differential was upgraded to limited slip.
Good luck with your project.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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