warm start issues on replacement engine

[viking64]

Car starts fine when cold.
When warm / hot will start after 10 - 20 turns on starter.
After looking thru threads was looking to take sensors off old engine and replace onto this one.
Have cleaned MAF & changed rear temp sensors and thought all was well - still there.
The engine I'm using was from a 92 salvage and sat idle for 4 yrs I reckon.
Am I on the right track with doing the other sensors or try something else - Car runs fine once it's running - but really feels like it needs to turn over more than it should before it gets running, and I know they normally pretty robust and start straight away

- heading to post count 100!