I would stay with the 15#, as the heater core will not like 19# at 50+ years old.
The oil pressure does sound like you got the high volume/pressure pump. Contact Melling and ask about converting to standard pressure. Maybe they can send you a spring... ?
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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