It is entirely possible to get a 235 to start and run with the tang that drives the distributor not engaged with the pump. I did it one time with a brand new motor, just once though, lol. Try loosening the screw on the vacuum advance. Not the bolt,the screw. Get it loose enough so the advance will slide on the distributor shaft. Use a remote starter and gently tap the motor a bit pressing down on the distributor. Hopefully it will drop down. Once it does, you have to reset the timing. The other way to do it is to put a chalk mark on the body of the distributor at 12:00 to the block. Then pull the cap and rotate the motor around until the rotor is also at 12:00. Now, pull the distributor and use a long screwdriver to rotate the oil pump (the receiver part for the tang) so that it lines up with the distributor tang. Install the distributor so that the tang goes in and the chalk line and rotor are at 12:00. May take you a couple of tries. Do not move the motor at all. Also, just as an FYI, If you have a junk distributor, you can pull the gear and all of the insides and make a preoiler. Pull the distributor and install the preoiler, chuck in a drill and spin and check if oil pressure. If no pressure then pump is likely bad.