Worth the trouble?

the heads are the stock van heads. not sure on the casting number. but they have been ported and had some bowl work done. i gasket matched them to the intake and exhaust and smoothed them pretty good. not sure what they flow.

the compression ratio is whatever a van motor was stock. probably 7.5 or something close.

the intake i used because i got it brand new at a swap meet for $40. the carb i got for free and rebuilt it.

i was thinking maybe bump the comp up to around 9.5 to 10. and possibly change stall converters. as well as 4.11 gears. it drives fine and has a good launch for what it is. but i know there is alot more there. the timing has been tuned to 36 degrees full advance i think.

the engine i built in highschool when i was flat broke. now im bored of it and want MORE! lol.

my boss told menot to mess with it unless i wat to go throught the whole thing again. its never been bored, the engine had 50k miles on it when i tore it apart. there was still factory cross hatchings on the cylinders so i honed it and left that alone due to money.
my boss told me to leave it alone and just save for aluminum performer heads, as well as carb+intake upgrade and then ill notice a gain.

i just dont know where to start. i hate the thought of buying $1500 set of heads if i can work with what i got.

also i shift it at about 6300rpm. by then its pretty much out of steam.

thanks for all the info guys.