It' hard to tell the experience level of posters on here, after only one post.
You don't seem to be a beginner and already know how to turn a wrench.
I found the tube header and 2" exhaust opened up the breathing quite nicely for the Weber. I used the long tube Pacesetter. For some reason, they make one of the tubes in two pieces, with a slip joint. The rattle will drive you nuts! I took it off and welded the joint. No problems so far, after two years. I didn't think I needed more top end on a motor that will turn 6k +, on stock carb and exhaust, so, I went for the long tube, over the other short tubes available.
On my 1.3 rebuild, I stepped up the exhaust valve size to the 1.6 size and went with the Isky low end cam. BIG difference in the bottom end torque. It pulls all the way down to 2000 rpm. Much less time spent rowing the stick, looking for the right gear. There looks to be enough meat around the valve seats to go bigger on the intakes, too (next time).
It turned the little guy into a real truck motor. I also changed out the pistons for some flat tops. I had to send the first set back, because the pin to top height was going to put them too far out of the hole. The block had to be decked .009, to flatten it out. The next set of pistons had .015 shaved off the top and made me a little more comfortable with the end compression ratio. I can still run regular unleaded. It kept it a non interference valve train (Play Dough test), which is nice with the rubber band timing belt. There's lots of clearance in the head on these little guys. It will also run freeway speeds, with 215/75/15 tires (I have the later model 5spd, with the lower 5th gear). A little busy under the hood at 70 ~ 75mph, and a head wind is your enemy, but doable. I'm at 5000 ft elevation, so, I think sea level would be very driveable. No overheating problems, even when I took it to Tucson, on a summer day. If, I drive it nice, I can squeeze 23mpg out of it, Hwy and city.
I almost got by w/o turning the crank. Just on the high side of meeting stock clearances, if we had decided to polish it out. Same with the bores. Clean up and hone would have been iffy. We settled for .50 mm overbore. Motor had about 130k miles on it.
I've only had my 71 FJ40 up to about 75. Stock 1 F motor and 4.11 gears is pushing it at that. The stock worm and sector steering, with center arm, drag link and relay rod, doesn't help much , either. Steers worse than my 01 Dodge Cummins, even after all new tie rods, steering gear rebuild and knuckle bearings. What can you expect from a 60+ year old design?
Other toys? Well, my favorite right now is an 01 Audi TT Quattro roadster. As soon as I can keep it from overboosting and going into limp mode, I'll let you know how fast it goes.
As far as the most fun for the buck: The Samurai can't be beat.