I sure do know where to get a 225 slant six i used to have one my self . A 77 plymouth volare had them or the 75-77 dodge aspens had them . Most of the dodges from 73-77 that wernt a muscle typ car or may have had engine options had them .

In very rare cases there were aluminum block 225 slant sixs . Mine had a 4 bbl intake nitrous the head was re worked and was kinda cool . They only have 110 horses but can be made to put out 300 if worked over properly

Try the internet for clifford performance they make all kinds of stuff for the slant six

Jason