What is the actual temperature of the engine? Odds are it still has the lousy 17 to 1 S series pistons. On occasion replacement sleeves and pistons will get mixed up which will drop compression.
Sometimes somebody will grind the valves and seats instea dof replacing them. This sinks the valves, drops compression and makes starting worse.
With S pistons a 53 series won't fire without a block heater when below 45F . Unless it has a 24V starter that will increase the cranking rpms .
My 2-53 will fire at 32F after half a dozen turns without either or pre-heating with the N series 21 to 1 pistons. And the N series injectors.
Better yet is the ultra fine spray pattern from the C series injectors.
It maybe time to do a 100% tear down and inspection. Odds are somebody took a short cut or blotched the assembly.
There are updated valve springs to reduce valve train breakage from valve float. There is a blower seal update to prevent lube oil fueled run aways.
The Previously mentioned N pistons/sleeves and C injectors are vital.
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