A timing curve with more initial would help,possibly more total with a bigger camshaft & heads. That exhaust system, needs help. 2.5 all the way back. Love the quick gig,for the track.. (OPINION J.M.O.).
I'd keep turning timing in until it slows down. The increase total will also boost initial which will help bottom end performance, especially with a tight converter. I'd likely have about 24 minimum on that set up for initial.
Exhaust size is hurting is hurting it. Headers could be longer, in the 36" range. That would help low end/mid range tq as well.
The 2.19 60's is a symptom of tight converter and low initial/curve. 2.19 is a mid 15's or worse 60' time. 98 mph should be is mid/low 13's.
With some tuning, converter and launching, it should see 12's with a decent 60' time (1.80 or better).