[Excaliber]

Not an expert, but I did rebuild my 427 Side Oiler and have learned a bunch hanging out here for a couple of years.
My High Riser fits fine in my ERA and thats with TWO Holleys under the hood! I've heard Hi Tech is very very similiar in that BOTH cars closely match the originals in the body shape, size, configuration.

.030 over bore on a side oiler is MAX, IF you can even go THAT FAR! Gessford (and others) re-sleeve without any problems. Check Gessford.com web site for pricing on re-sleeve. Or just give George a call, his number is on the web site.