1970 buick electra engine miss firing

after years of storage i started up my 1970 electra 455 without too much trouble, but the engine definitely misses fires and is sluggish under load. i have replace the plugs, spark plug lead, the dist cap, coil, condenser (dont think i needed to) points and rotor. its better, but still missing at idle. whats my next step?
 
i think i'd replace all rubber fuel lines while you're at this. 45 year old rubber is getting kind of sketchy by now.

and you definitely do NOT want to have a fuel leak.
 
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