SB Chevy Valve Covers

[My70C10]

My sons 70 C-10 has some Edelbrock valve covers that I guess are baffled on a 350 sbc v8. It takes 5-7 minutes to pour 1 quart of oil into the heads through the breather port without the oil overflowing. If my memory serves me correctly, my dad's 65 Chevy shortbed fleetside had I think a 1969 350 sbc with an oil filler cap on one of the valve covers...not a breather hole but just sort of a flat metal cap that would lock down when turned clockwise. Does Chevy or an aftermarket vendor make a valve cover with a capped oil filler hole in addition to the breather hole?

Thanks.