1966 Plymouth Valiant Signet Hardtop

New to the site and looking for some guidance on a budget build. I recently inherited a 2 door Valiant from my grandma. It has a 2 barrel 273 in it. 3 on the tree automatic, bench seat. Can I make the motor into a commando and add a edelbrock ld4b aluminum intake, layson’s full headers, 10.5:1 egge pistons, Holley 650 carb, and a Isky camshaft as close to stock? What can I do about upgrading the k-member? Who builds a affordable coil over suspension, these torsion bars got to go lol. The front end can use a weight reduction and use some tubular. I would like to improve the steering, what’s the best manual modern day steering for daily driving and slight racing around. Will 15X8 wheelvintiques fit without modification? I found a company that produces a fiber glass hood and trunk lid so I can reduce more weight there too. It has a 7-1/4 rear end, not sure of the gears. Do I need sub connectors, if I want to make it a manual transmission will I need to fabricate a tunnel for the floor