No. How do you shut off the fuel flow when the engine quits.
That is the inherent safety with the existing fuel pump
No cylinder pulses, no fuel pumping
There was a round gauge conversion kit back in the 90s. It's been NLA for 20 years. You may be able to get the later DP-D and later setup
I moved my square trim gauge out of the main cluster on my rebuild since I had just replaced the trim gauge
If its really stuck, and only iff its really stuck. just use a vice-grip on the plug and a vice-grip on the hose end hex.
when tightening, NPT is only 2-flats past finger tight
I would throw that filter away as you should have the fuel/water filter upstream.
however the hollow conical part goes against the incoming stream of fuel, the spring holds it against the fitting.
At the top of the restoration forum are stickies. 4th one down is the DIY for boat restoration.
Links 14, 15, 18, 2, 3, 4, and 4a have all the information you need