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Unless the bolts were supplied with them, I would say no...

I have used flat washers under head bolts when adapting 351W heads to 289/302's but they were a special hardened washer made for use with Grade 8/9 fasteners...

Since you're building an inliner, I'd pass on the washers.....

BTW, it's always a good idea to chase your threads in the block and check the bolts for bottom clearance...don't want them bottoming out when torqueing...
I use studs in my engines so I have to bottom tap the holes prior to stud installation..

Pat
http://www.jps.net/binay/webdocs/strtmstng002_sml.JPG
 
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