hoping someone on here can offer advice or a solution to to my quandary. - Rubuilt my 360 sb some time ago…..030 over; speed pro hypereutectic pistons ; Clvite bearings; Hastings rings; 11.2 :1 static compression mild cam and re graphed ignition initial 16BTDC. Recently ran the camshaft in using an engine test stand . Ran it for 20 mins varying revs etc as per proper run in procedure. Engine is now in the car and starts up perfectly runs solid, crisp sound response on throttle is brilliant and oil pressure sits on 60PSI. Problem is, if I run it and bring up to temperature and then try and restart it, the battery struggles to turn it over. Battery showing 12.2 volts so I’m sure it’s ok. Engine was very tight whe turning by hand before initial run in of the cam. Any thoughts??! TIA