Amid the recent drop in crude oil prices, investors are certainly scoping out opportunities in energy stocks.While big oil giants may come to mind, Delek Logistics Partners (DKL)  and MPLX LP (MPLX)  are two companies that shouldn’t be overlooked after making their way onto the Zacks Rank #1 (Strong Buy) list.Having critical operations in regard to energy infrastructure, here’s a look at why now is a good time to buy these highly-ranked energy stocks.Delek’s Financial Performance is ImprovingReporting its Q ...