If you enjoy sprints on the IN tracks. You'll like Lincoln Speedway (3/8 mi) best.
Good 410 & 358 points show most Sat nights.
Grandview is good too, but doesn't have sprints weekly, but is good for PA Speedweek, Keystone Cup week & the USAC visit.
Williams Grove & Port Royal are the big, fast 1/2 miles.
Fri nights at the Grove get the biggest car counts.
Then they split up Sat between Lincoln & Port Royal.
For a long camping trip - the best times to see all the central PA tracks & teams are
Keystone Cup Wk (last week in May--> Mem Day) &
PA Speedweek (last wk in Jun --> July 4)
For a quick trip --
almost any wk at the Grove (Fri), then Lincoln (Sat) or Port (Sat).
Regular points show, with handicap starts are good.
When the All Stars visit or they have a special regional race (larger car counts), they line up based on time trials.
Any night you can get both 410's & 358's are good.
It's also a good show when the regulars run vs the touring All Stars (410's) or URC (360's), or the ARDC midgets are on the card.
Of course, the best racing is the week USAC visits.
He's right about the eastern Mods, too. I think they share the card when the USAC sprints visit New Egypt, NJ.
My favorites (in order) : 1.
Lincoln 2.
Williams Grove 3. Grandview 4. Port Royal.