LT1 oil pressure problem HELP!!!!!

[69-nova]

hey i need some help. recently i bought a 94 firebird with an lt1 to have as a daily while i build my 69 nova. the firebird has 82k miles and isnt stock was built about 6k miles ago. usually wen i start my car and its cold my oil pressure is around 60. then wen it warms up its at 35ish at idle and 40 cruising at 1k rpm.well yesterday i noticed it was at 40 wen i start the car up wen its cold and about 25 30 at idle and 35ish at 1k rpm. should i be worried? any help is appreciated.