What PEDs did Jim Rice use from 1977-1979 (and maybe 1983)?

The steroid hot topic got me thinking (I know that's dangerous), but what was it from 1977-1979 that made Jim Rice so much better than the rest of his career?

Here are his stats for that time period versus the rest of his career:

Year	G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	BA	OBP	SLG	OPS	IBB
3 years "juicing"	160	647	114	207	31	12	41	128	7	56	114	.320	.375	.596	.972	7
"clean" years	139	546	80	160	24	4	23	93	3	44	94	.294	.347	.478	.826	5

So he hit for more power hitting nearly twice as many bombs. His BA was up over 25 points. He had ZOMG MORE RBIs. He was considerably more "feared" considering they gave him 40% more intentional passes.

So what steroid did Jim Rice have that gave him this extra pop?I just don't get it. I thought PEDs were only a problem today, so how can one explain these seeming outliers?

*A couple of notes:

I did not include his first and last seasons since they were both less than 100 games (and bad), and I didn't want to skew the numbers.

I didn't include GIDPs because at least he got the ball in play rather than striking out.