help with 318 upgrade

Hello All,

Car is a 39k mile 70 dart with 318, 4 speed,3.55 8 3/4 suregrip, and is used for cruise nights and weekend driving. I would like to do some low dollar upgrades on the 318. This is a "for now" motor and later on we'll build a 360 or stroker with a block I have. Here is a list of what parts I have accumulated over the years and I would be thankful for some advice on which way to go. We have a set of stock magnum heads that have been fully machined and set up for a little over .500 lift, professional products intake, used hooker headers, set of 340 hipo exhaust manifolds, comp cams hi energy cam 218/218 454 454(not extreme energy), edelblock 600 cfm carb.I was thinking not to pull the motor apart, just do the top end and new timing chain. What do you think, use any of these parts or go with something else?

thanks