Newb Oil Filter Question

Leave it on there. There is no reason to use the block mounted oil filter, especially if it forces you to use a short filter.

Decent 340 exhaust manifolds require that right angle adapter. IIRC even the performance 273’s got the right angle adapter.

Any good set of headers will require a right angle adapter.

The short filter is a far greater restriction than the right angle adapter.

Chrysler knew the short filter was a bigger restriction. Keep it and use the longest filter you can fit. You engine will appreciate it.