Putting A '77 Slant In A '64 Valiant?

Something I'd like to throw out there, your '77 slant stock horse is 100hp @4000RPM. In the later 60's (64-71) the HP is 145 @4000RPM. Check out this site: http://www.allpar.com/slant6.html (also lists the differences in HP, other, over the years)

I've gotten a '75 slant with a 904 trans for a couple hundred from a guy in Salt Lake UT. bout a year ago. It was incredibly filthily, and many things had to be done to it. I had my '65 Cuda sitting in my backyard for over 12 years and decided to finally do something to it. Rescued that Mopar from a crusher long ago, and have been fixing it up since last year. It only came with the 225 Slant Six (numbers matching to the car) no trans, no drive shaft, no back brakes, and other things. Initially the original (65) slant to the Cuda was locked up, and I didn't know better at the time that the 65 slant had 145 Horse stock vs the '75 slant I had been working on having only 95 Horse stock. They really screwed with the power on those engines due to emissions in the 70's and up... I evidently got the '65 slant freed up by popping the head off (and the word popping isn't to be anticipated as an easy thing to do), and pouring some ATF+4 into each of the cylinders to get them freed up. But I was already too far (financially for me) into the '75 slant project and decided to throw that in with the 904 bolted onto it into the '65 Cuda (that was fun...). I still have the '65 slant and I do have big plans for it in the future. What I'm getting at is, make sure you're going to do something good to that slant six engine of yours, and look into the head differences in years because I am sure there are some major differences to cutting off nearly 50 horse power in a 10 year difference towards 1975-77. Any who, hope to hear what happens with your Slanted Project!