Installing 95% oil filter system issue

I think the clearance issue is going to depend on a lot of factors that can very between installations. You just about going to have to figure it out as you go. Might consider a trial fitting with a separate piece of tubing before you start binding the one you intend to use.
 
If you are worried about clearance with your headers, then you can put an 1/8" NPT 90 degree male-to-female elbow into the block, then the adapter from 1/8" NPT to 1/4" compression/flare. This should enable you to keep the line close to the block and away from the headers. Now, you may have to make or modify your own lines - but that isn't a big deal.

Best of luck on getting your new engine done and on the road!
B&S
 
Couldn’t find the right adapter at hardware store. Found the 1/4”-1/8” pipe thread adapter but couldn’t find the one with the nipple on the inside that the tube flare needs. What’s it called? Thinking the ones I found that were similar but w/o a nipple were NPT.
 
Couldn’t find the right adapter at hardware store. Found the 1/4”-1/8” pipe thread adapter but couldn’t find the one with the nipple on the inside that the tube flare needs. What’s it called? Thinking the ones I found that were similar but w/o a nipple were NPT.

I'd go to a NAPA store or maybe Jegs or Summit Racing - they have extensive catalogs of fittings.

When it comes to flare fittings - you need to know which flare type - there are three. It is most likely that you're looking for a 45 degree angle SAE type flare. Don't make the mistake of buying an aircraft flare 'AN' of 37 degrees.
 
I discovered the correct fittings were on the filter I got. There’s 2, the one at the top is a 90 degree, the one at the bottom is strait. Just to get the motor in I took the 1 off the bottom & used on the return treaded hole on the block. Good for now. I think the correct designation for the fitting is npsm 1/8” male-npt 1/4” female, adapter.
 
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Here are the instructions I used on my flatheads. Now I still have oil pressure at an idle.
 

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Got it & thx again! 51 Merc-Ct SleezeBay had
 

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These are the instructions I used on my engine. Now there is oil pressure at an idle.
 

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