Just my twopenneth...
I had a new 1500 engine built at vast expense recently,when it came back after running about 6 hours on rollers to break it in,it had a note on the dash saying:
"Spin the engine over with no choke for 30 secs to get oil pressure up".
It had a cheapo filter on it,I have used Mann 719/29 on all my 4 pots with excellent results,i changed the filter to one,instant oil pressure on startup and no apparent drain back.I will stick with it,all you need is a thread adapter.(and decent oil).
Steve