Although personally I think a L67 would be awesome in a street rod, I would go with many many other engines first. The typical street rodder frowns upon 6 cylinders. When you go to a big car show, like the street rod nationals for instance, pretty much every single car there has a V8 in it, unless of course it has the factory drivetrain. Personally, I would go with some sort of V8 Chevy Crate engine, unless I was trying to make something all ford, then maybe a 351 or something, and obviously for a Mopar, there is nothing like a 426 Hemi. I have been going to street rod shows since I was born, and my dad owns at least one street rod a year (he buys them at the beginning of the summer and sells them at the end so he has something to play with during the summer but doesn't have to bother with storing it), so I've seen all sorts of things, but honestly a small block chevy would be significantly cheaper to put in the car, significantly cheaper to get power out of, significantly cheaper to maintain, and with the right combination of parts would attract a lot more attention.
But, thats all my opinion. I would hate to steer you away from something you really want to do, just giving you my view on it.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!