I'm thinking NO.
The only fancy 428 in 1966-67 was the 7-Litre & I don't think that ran chrome PowerbyFord covers.
Maybe a 428 Shelby or 428 CJ LOL?
IIRC the PowerbyFord covers didn't come out until mid-1967 so could that engine be a 1967-68-69?
What are the head and intake casting numbers? Date code on the front/top of the intake?
Then again those could have been changed.
About the only way to tell a 428 in the car is with a dowel rod into the sparkplug hole. Mark the dowel rod at TDC #1. Then, without moving the crank, put the dowel into #4 and mark that (should be exactly at the bottom). The difference will either be 3.784" or 3.984" which will tell you if it's a 390 or 410/428.
Next step is tear the heads off if you want to know for sure.
EDIT
Oops I misread but still NO.
IIRC the THUNDERBIRD valve covers (with no holes) were only used thru 1964, and no 428s until 1966 so they didn't even overlap.
The only possible exception might be a 428 PI from 1966, maybe somebody knows.
Mostly in 66 Ford used the low pentroof covers, and they wont work with solids.
The 427 ran solids but used tall pentroofs.
I'm not sure what the 66 428PI ran with its solids - either tall Pentroofs or old THUNDERBIRD covers, but that would mean a 428pi intake with the oil fill in front. Not sure what the setup was on those.