I think the difference is that the Escort is a fundamentally floppy car that needs a lot of strengthening for competition use. The Alfa is much stronger so seam weld it and it'll do pretty much anything you want.I upgraded my Escort mk2 with Gartrac Watts linkage kit to reinforce the chassis with upgraded shock turrets and brackets the kit. For peace of mind and negligible expense whilst welding away, the results was much improved chassis control with normal road suspension so a little surprised nothing like that is available for Alfa
We've got a customer who's stage rallying a Giulia Sprint GT in historics. He pulled the car apart for its off-season rebuild and was astonished to find that the bodyshell was mint bar the odd dent.
His comment was "I can't believe how strong this thing is. If this was an Escort I'd have been welding the whole f***ing thing back together after what this little car's done".