Starting question: Sure your windshield is set at the right angle? Can it be pulled back just a bit more by adjusting the bolts in the windshield brackets? Those brackets have slotted holes in them to allow for some adjustment of the windshield angle.
Also keep in mind that on a '75 and earlier, the windshield angle was different from newer models - the older being more upright. If the doors aren't for the correct year, they won't match up with the windshield angle correctly.
Now on to the doors. Your pics show more of a gap at the leading edge of the doors where it meets the windshield frame rather than sealing at the very top of the doors where they meet the frame for the top. This would be more of the door being installed at an angle (doors are not level front to back). Here's a shot of my door install instructions showing the adjustment points. If you have the adjustment points shown in the pic below (lower right image in the pic), then there's your place to focus. If not, then adjusting the lower hinge pin can help with straightening this issue (move the bottom rear of the door further up so the top front of the door is closer to the windshield frame). This adjustment is shown in the bottom left part of the pic below. Even my older
CJ5 doors without the extra adjustment points had an adjustable lower hinge pin. Hopefully yours does too.
The top part of the doors can be bent inward to close the gap to the frame of the top, and your doors should have a rubber weatherstripping on them that seals against the frame of the top going across the door opening. Newer Bestop soft doors have extra adjustments in their frames for this. But older ones can still have the framing in the upper part of the doors bent inward as needed. On the other hand, it's a Jeep and in my experience I have never been able to completely seal out wind/rain with a soft top and soft doors. I have a zippered car cover made for a Jeep that I use when it's parked and there's a threat of rain so as to minimize water entry while parked. A nice trail cover can also serve this purpose. But of course when driving in rain, just keep your knee away from the door.
I also had to slightly bend the three vertical "rods" where the upper half of the door attaches to the lower half (the lower right pic). So by adjusting the collars on those rods, I got the left-right adjustment good (door level and tight to windshield frame); and then by bending them inward slightly, I got the top part of the upper door half to sit more snug against the frame of the top where the weatherstripping of the door seals against. It takes a heavy rain for water to come in mine, and usually only when driving and wind is making the door move/vibrate a bit.
