Just a suggestion and hopefully its accurate. In 1988 or 1989 Dodge improved the 318/360 heads with a smaller swirl combustion chamber. Still an LA old school head but with a better CC. I looked up replacement heads on Rock Auto.com for a 1990 Dodge truck 360. Granted the intake valve will not be the 2.02" like the 340 magnum but for a price that can be changed. $349 each. Big block mopars have 440 Source for an aftermarket head that looks stock but small block have no option in LA offering.

https://www.rockauto.com/en/catalog/dodge,1990,b250,5.9l+360cid+v8,1073573,engine,cylinder+head,5304