Trying to Gauge Interest In Some Parts

An exhaust manifold to a standard turbo flange would be very popular, but perhaps not the type of fab you are considering.

A bracket to mount a Sanden AC compressor would be popular. There are some already for ~$240 (Nostalgic Air) so you would have to beat that. Would have to work with pwr steering and maybe turbo above. Also, many early slants have just a single crank pulley though later engines can be robbed.