1966 valiant worth getting a 230 (or 240 can’t remember the numbers)

A230s came behind big blocks as well. Your problem is going to be that it will not fit in the stock transmission tunnel. You're going to have to do some creative stretching. I plan on using a port a power on mine. It will also hit the top of the tunnel just above where the cross member is. It's not by much though and I think a creative dent would make it happen. I've tried it in my 64. It doesn't fit. So I put my A903 back in it "for now".
Welllllllll that sucks lol. At least some creative stretching isn’t all that bad. I have body work and customizing experience so I can do some if that, but depends on how much needs to be done. Might just keep the 903. I finally got the 170 running and yard drove it ( still no brakes and got a little exciting when the porch was getting faster than I expected, but got it stopped haha). Thanks for letting me know about the fitment issues.