They don't look terribly tall - figure most carbed engines have a taller intake manifold, then the carb / tbi, then the 3"+ marine air cleaner I could see them being about equal

Then again my perspective from the picture alone could be way off and my reasoning equally wrong

I have these. They are fresh . Probably a lot more power than your looking for.
https://cimg6.ibsrv.net/gimg/www.off...d97c88085.jpeg
https://cimg9.ibsrv.net/gimg/www.off...dff1f07b3.jpeg

They actually are the same height as the CMI sport tubes. That was one of the reasons we partnered with CMI for the header design and manufacturing. They knew how large the envelope was they had to stay in.

Ttt

I have a pair of 40hrs on complete rebuild 525sc clones but improved, made 620 with 177's. I sold the baby blowers with the plan of putting 8-71's on them. Long blocks minus intake $12,000.00 US for the pair. Up in Canada so could be more of a pain than it's worth.

Ttt

Whipples 509. Gen 6 502 built by Ron Potter. Low hrs. complete drop in. Exhaust, fuel pumps, bellhousing etc. 3.3 whipples. Low boost 650 hp. 44us Fresh service. Plugs, oil , filters, seapump, cap rotor.
https://cimg1.ibsrv.net/gimg/www.off...a2bf669887.jpg

I have rebuilt 525 efi. Brian 305-893-5018