300/440/550 looking for jetting advise for a 85 js550 with a sbn

Location
ST LOUIS
started engine for first time after rebuild,bored 1.0mm,jetco exhaust manifold and pipe,mariner water box,and a new sbn 125 main 100 pilot 65gm spring,engine is hard to start,have to hold throttle open 1/4 to start,not sure where to start
 
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