Small Blocks

here are a few;
A better rod-oiling system, and more oil to the top-end.
Longer lasting bores.
No pushrod pinches.
Just say no to nylon-tipped sprockets, and single-row chains.
NO open chamber heads ever!
Variable valve timing, or at least an automatic cam retarder

Also rans;
More screws to hold the valve covers down with.
Umbrella oil seals banned forever.
A deeper sump.
A better rear main seal

Dreams;
DOHC with adjustable bucket followers
Long-rams
an Engine driven PTO
All cranks same main-journal sizes, thus the 273 transforms to a 301 with a 30 over, and suddenly a billion 273 blocks become gold, lol; I mean, with a longram, she'd be a 3.66 x 3.58 torque monster, easily capable of 30 mpg on a bad tune. yes I'm kidding, lol.
Cranks running in adjustable eccentric saddles, that you can adjust how high up the piston goes. ie, variable compression. No I'm not kidding. You want more pressure? just raise the crank up a couple of turns. Can't get rid of detonation? just drop the crank a few turns.