Great starting became hard starting.

Its usually the boring that goes bad.

JEGS 150249: Needle & Seat Hardware Kit Made in the USA | JEGS

What I have found is I'll go buy a $16 needle and seat from Holly just to have the thing flood my engine out a week later.... though when I pull it back out... it's fine except that O-ring. Save the money and just get the o ring kit if it looks good when you pull it and inspect it.