mileage i cannot say for sure but estimated b/t 60-80,000ish. obd1
500 picked up for the longblock should be good, read some of the stuff on it though in my h2b for sale thread so you have a better idea.
I think the casting of the block was 94. I'm in State College PA 16803.
The bottom end looked (closed deck) good when i replaced the gasket with a cheap one to investigate the loss of compression, theres an exhaust valve on cylinder 4 that stuck on it until it warmed up, its been gone since, but haven't checked the compression lately.