the k member is kinda the last thing as they aren't a cheap conversion, its cheaper to strengthen the one you got. Everything you mentioned is the cheaper route especially if you make your own, inner fender braces, lower rad brace, subframe connectors, torque boxes, rollcage (if you go that route) stitch weld your body, stiffen your lower control arm with a plate, ect will all help you when you move up in mods, next cheapest big hollow front sway bar, rear sway bar, adjustable strut rods, stiffer leaf springs (fiberglass), big torsion bars, corrected geometry and adjustable upper control arms, shocks, boregson power steering, ect ect

the k member is kinda the last thing as they aren't a cheap conversion, its cheaper to strengthen the one you got. Everything you mentioned is the cheaper route especially if you make your own, inner fender braces, lower rad brace, subframe connectors, torque boxes, rollcage (if you go that route) stitch weld your body, stiffen your lower control arm with a plate, ect will all help you when you move up in mods, next cheapest big hollow front sway bar, rear sway bar, adjustable strut rods, stiffer leaf springs (fiberglass), big torsion bars, corrected geometry and adjustable upper control arms, shocks, boregson power steering, ect ect

On the k-frame, you can see how I added welds to that. I added on almost 130 to the factory 40 or so plus additional gusseting. On the front inner fender area, I've added welds to the shock brace/upper control arm attachment/along the top of the frame rail where I could get access. You could do this on the rest of the car in areas that are accessible if you are willing. On the areas between the factory welds, I could add at least one and sometimes two welds in between the oe welds. You can make up a new lower radiator brace/tie bar like I did and also make up a core support like I did too. The subframe connectors have choices. Square tube, rectangle or US Cartool. All need to be welded, some are less involved. For any of them, you need to remove carpet, insulation and seats so you don't flame them. Good time for replacements of them since they are out. You could even go to a roll cage setup like on a dedicated race car. Lots of possibilities. I'm just going with the basics on mine with some upgrades I feel like adding.

I have a '62 Fury I was considering running at the local autocross once in a while (6-8 times a year). it will be street driven most of the time so it needs to drive well on the road.

I have plans for a mild built 383 with a 727.

What are easy/fairly cheap mods I should consider to have fun? I'm guessing sub-frame connectors, larger t-bars, shocks, sway bars and maybe disc brakes up front.

Anything else you can suggest that isn't a lot of money (e.g. aftermarket front k-member, etc)???