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Is that a -B- on the front of the passenger mount what does that mean?? I just noticed Mine has an -A- on it is this a way to tell the difference between the big block and small block K-frames? I'm getting totally confused here why do factory big block mounts in a factory small block K-frame work for some people but others it won't. My engine compartment and K-frame will be painted before I load the motor in from the top. I wasn't planning on doing a test fit before painting but now I'm thinking I better.

My first engine swap ever was dropping a 383 six pack into a 73 RR that was a 318 car. Took all summer because (as a kid) I thought it would just bolt in.

After some research, I bought (IIRC) 400 Motor Mounts for 73 RR and I had to change the oil pan because the 383 sump hit the K-member and would keep the back of the engine from dropping down correctly. I went to a JY that had HUGE STACKS of OIl Pans. I spent several hours going through the oil pans until I found the one that would had the sump further back than mine. Don't know what it came from it was in the stack. Once I put the oil pan on, everything lined up fine. I do not know what the 383 engine and trans originally came out of but I pulled them from a 66 Fury a guy had "rodded". I don't recall having any issues getting the transmission to work, however the tail shaft was longer on the big block trans and I had to get a shorter driveshaft which I found in a wrecked big block RR in a local JY at the time.

Car ran and drove great w/ no issues.

Looks to me like the big block and small block k-frames are different. The small block mounts are set further forward and the left one is slightly more forward than the right mount.
See the photo - compares the above big block k-frame pics to pics of my small block k-frame.

Thank you for the comparison pics I will order the Schumacher mounts on Monday. Schumacher's website says you need to cut some of the mount for oil pump clearance. Has anybody done this ? can it be done safely after the K-frame/engine compartment are painted ?

The k-frames are physically the same pieces, the difference is where the motor mount perches are welded onto the k-frame. My car came with the 440 in the small block k-frame with original type 440 mounts. It fit in but I have since changed to the schumacher conversion mounts. When I first got the car, the 440 sat too high in the front and too far forward. The conversion mount dropped the motor down about 1" and moved it back about 1". I now have more fan-rad clearance and it got rid of a pinion angle mis-match which was causing a vibration at speed. It fit with the mis-matched stock stuff but I now have more clearance for aftermarket intakes/air cleaner and my el-cheapo summit headers fit great.

Wish I had been able to access info. like this when I did my car. Maybe, it wouldn't have took all summer. I know that I was able to get it to work but perhaps the alignment was off w/o me knowing. I do not recall anything being terribly out of line but there is obviously a difference between the 2 K-members as shown in the pics.

Joe

Thanks Guys

Now I know for sure it is a BB K-member like my dad said, but I have no idea what mounts to use or how they go on the engine. ANy help would be appreciated.

Seems that the last three cars I owned have used motor plates.

It's pretty straight-forward. You need a set of spool type BB motor mounts. The mounts bolt to the ears on the block and each mount takes one long bolt that bolts the mount to the k-frame perches. Should be able to score what you need for pretty cheap.