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Stalls at Highway speed on 1990 Dodge Ram Van B250

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
'87 Dodge Van B250 318 - sat for two years, fuel system/everything rotted, replaced tank, sending unit, fuel pump and filter, lines replaced, ECM, caborator, distributor, plugs - starts easy, engine sounds great/smooth UNTIL it runs on the highway, after about 10-15 miles it will stall out, it restarts but then stall again. Swithed to electric fuel pump and by-passed ECM with manual distributor, problem still not resolved. Any other ideas?
(1) Answer
I sounds like your fuel filters have clogged up, even though you have replaced them. The intank filter is especially vulnerable to clogging restricting fuel flow under load.