Disregard. I was finally able to get to a desktop computer and answer my own question. Trying to do some research on a phone in the garage with greasy hands sucks.
Sorting Out: Chrysler’s 238, 318, 360 Engines, Doug Anderson, Automotive Rebuilder, April 2000
Relevant stuff from above link below.
CHRYSLER 360 BLOCKS
1989-’90
The 360 got a new block with three cast bosses in the valley for the roller lifter holddowns. Although all of these engines had fuel injection, they continued to use the cam with the long snout along with either the eccentric or the special cup-shaped washer. Both intermediate cam journals had holes to meter oil topside. The 318 and 360 cams are different and shouldn’t be interchanged. The most common block castings are 4315830 and
53006921. The later block (53006921) was used in ’91, too, so check the oil filter boss to see whether it’s a ’89-’90 or ’91 before using it for either application.
1991
This was the year of the corporate oil filter, so the 360 block was changed along with the 238 and the 318. The oil filter boss was 0.250" shorter so both the plate and adapter were modified accordingly. The rear main cap had a dowel pin and may or may not have the recess for the o-ring. The cap was still grooved for the rear pan seal. It had the old style ears for the motor mounts. The block was the 53006921 casting that was carried over from ’90, so once again you have to physically check the length of the filter boss to be sure if it fits a ’90 or ’91.
1992
This is a transition year with a rather unusual 360 block. It looked like a Magnum on the outside with the three flat, drilled pads along with the old style ears, but it was still the early engine on the inside with the oil holes in the cam and block. It’s a 53020006 casting.
That’s all there is to the 360 short blocks. They follow a pretty predictable pattern except for the oddball block in ’92.
The 360 heads are just as predictable.
HEADS
1989-’92
When Chrysler switched to roller lifters in the 360 in ’89, the pushrod hole was enlarged to 0.660" to handle the difference in the angle of the pushrod. These heads appear identical to the earlier smog heads, actually sharing one common casting; so it’s easy – and expensive – to mix them up. There are two castings, a 4323345 and a 4448308.
