I do not think that the 2,0 T4 bus enine fits in an >67 bus a good deal of cutting in the sheet metal, if at all.
But if you use the >78 model bus engine /heaterbox/exhaust, that should fit without much trouble.
But everybody I have seen and talked to said there was a problem with the cooling, so they converted it to an upright version.
Having said that, I know evrything is possible. It just requires more time
