High praise from Doug Flutie ... the ex-Bills QB says he loves Josh Allen so much, he could see the signal-caller one day taking the title of best-ever Buffalo quarterback from Jim Kelly.
Flutie dropped the compliments after dining with Joe Montana in Los Angeles earlier this month ... saying he's just that big of a fan of Allen's.
The 59-year-old, though, said the current Bills QB has a bit of a ways to go to catch the former one.
"I love Josh Allen, love everything he did -- he had a tremendous year," Flutie said .