Have Anti-Freeze in oil pan, No white smoke what could be wrong? on 1990 Chevrolet G Series Van (G20)

Engine won't start, anti-freeze in the oil pan no white smoke.
how can I tell if it is just head gasket or if it is something worse? 1989 Chevy G-20 Van.

A head problem is bad enough. The van is almost 14 years old. Do you really want to spend the amount of money to fix this van? I think not. Time to move on and look for another van.
The repair will easily cost at least $1,000 or more.
2 more answers , 2 more comments
do a compression test on all cylinders and get the cooling system pressure tested from there you will know if blown head gasket.
Possible intake gasket leak, very possible!!
When pigs fly and hell freezes over.
That time has come to pass, fixed a pile of them! For real. Especially on a pushrod engine! It's the most common cause in fact! Head gasket will steam from exhaust and/or pressurize cooling system, think about for awhile.