I need schooling - old vs. new engines

I'm not talking 600 hp, to me that is ridiculous. When I was younger and had all the time in the world we souped up everything from 170 cu in Plymouth's and Fords to Chrysler big blocks. They were all a blast to drive. My daily driver was a Hurst shifted, 4 speed, 64 Barracuda, 273 with about 300 hp that started and ran like it was FI. That was in the 70's and got mid 20's steady highway cruising. Want to burn rubber, spend an hour and swap gears to 4.10's. My 2009 Challenger R/T 6 speed manual gets 28 mpg. My 383 auto 68 Cuda gets high teens steady cruising on the highway. No mystery, efficiency goes up and you get the best of both worlds, FI or not. I don't even run heads past 1971. I run factory Carter carbs, a MP chrome box and distributor, and solid lifter cams. Are you faster, probably, but I already figured out I'll never have the time or money to play that game. Street only, fast, handles well, stone axe reliable is what I build for. No special parts, no computers, no cutting, just good machining and quality parts. I have always had one since I was 19, and that was 48 years ago. That is what A Bodies do best. The 2009 Challenger rolls easy and is very quiet, great car, but they are two different animals. I put more miles a year on the 66 Barracuda.

Oh for sure I don't know when I'll personally have the "need" for 600 HP I was just talking hypothetically as to what scenario a modern engine swap becomes "practical". I've been having tons of fun with "only" 300whp (uncorrected at 5000' elevation) in my Duster and it's been reliable as a hammer for almost 5 years and 12k+ miles. Hence why I have no rush to swap my 5.7 Hemi or add a Procharger. Although one big upgrade I will definitely be doing once funds allow is a 5- or 6-speed manual with overdrive. I built/am building my Duster for auto-x, track day type stuff and would also like to try out 1/2-mile drags at some point and the 904 with cheapo loose 2600-stall converter it currently has sucks for those applications.

Although once I move to Texas where 600+ HP street cars are the norm I may feel more compelled to up the ante lol. I can have plenty of fun driving up in the mountains in CO by myself or ripping around a tiny road course at PPIR but Texas is a different world in comparison. I've never been one to feel the need to compete with other cars all that much and just enjoy what I have but I'm only 31 and I'd like to at least try my hand at having something fast enough to compete with modern fast cars. Maybe it won't be satisfying and I'll just go back to playing with my stuff by myself lol who knows but I want to give it a shot eventually.