That's normal- - - -they're supposed to be a snug fit. It keeps the cap from shifting sideways, and keeps the bored hole perfectly round. Now, if it takes a medium velocity swing with a BFH, that's what we call "too tight!" You can chamfer the corners of the block and/or the cap VERY slightly with a file to help guide it into place. The aftermarket 4 bolt caps I used to install on 2-bolt race engines were intentionally made a few thousandths too wide to compensate for manufacturing tolerances between blocks, and had to be file-fitted, then line bored.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!