Your 1958 block ~should~ have two provisions for the throttle linkage pivot. If so, just need to move it to the correct spot and use the 216 linkage.
Looks like you’re on the right track. Get the right bellhousing. Front motor mount. Water pump.
The original 216 Bell-Housing (with Flywheel, clutch and starter) all work, right?
I found
this guide and this
Motor mount timing cover mod template invaluable.
