I put in .890s a
I just finished (well, almost finished — DNF'ed with a blown head gasket) a 850-mile vintage car tour on secondary and tertiary roads in Northern California. I have done this rally in one or the other of my Barracudas several times (not this occasion). The slant six convertible with the softest factory springs plus sway bar was just as capable as my tweaked Commando fastback for this kind of activity, although I wouldn't take it to track day at Willow Springs. Meanwhile, the replica Ford GT40 was crawling in low gear half the time (although as soon as the road surface smoothed out he was out of sight).
I did just install Bilstein shocks on the fastback and that seems to be an improvement over the KYBs, but I haven't had it on a rally yet.