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Well, is the blazer a 4x4? If so, it'll be kinda tight, but it will fit.
If a 2 wheel drive, you'll have so much room you could fit 2 HEI caps in there.
The 4X4 is mounted back in the inline 6 position, but even so, it'll still fit with no mods (read; bashing) to the firewall.
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