My Teriatory,
Get over it the spacers work just fine, i ran them 25 yrs ago and i run them today. The engine in my Malibu is a 377" and it's been 8,000 rpms. I also run 14 to 1 compression on alcohol. Actually the spacers are a plus they have 360 degree grooves and i drill an extra 1/8" oil hole at 45 degrees in the main bearing for extra oiling. I run a main girdle and it's 2 bolt block. In fact after i assembled the block and installed it in a dragster for the first run, we discovered a leak in the blk. We put 13 passes on the engine and it ran 5.16 1/8 and 8.23 @ 158 qtr. mi at Memphis. We broke out at Super Chevy with 5.14, we ran no water in the dragster. I then pulled the engine out of the dragster and found a 4" crack just below the deck of the blk. I welded it up with a tig/ hammering after each 1/2 weld with Ni-rod, didn't even pull the heads off. I then installed it in my Malibu and have close to 100 passes running 125mph, 10.50's qtr. and 6.52 in the 1/8 and the car weighs 3250 lbs.
I'm pulling the motor out this winter to install a 434", but the 377" is still ready to go.
JMO and experience
Zip.