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You have a stock 440-hp minus the HP exhaust manifolds. That will hurt you. As-is with those lo-po exhausts, I'd say you're probably putting out around the same HP as a stock 440-HP, 375. I'd imagine headers would be worth a good hp increase, probably 20-25hp for sure, enough to get you to the 400 mark.

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I'm not sure if ALL Jensens were HP engines, but the one in my 1974 Jensen Interceptor is stamped HP.
The manifolds are the center dump truck manifolds I'm pretty sure.

Hey Jensenguy, have you ever seen these?

http://cgi.ebay.com/ebaymotors/New-Hedma...sspagenameZWD1V